Set up FortiToken two-factor authentication. This is the output of the command diag vpn tunnel list on the FortiGate: inet ver=1 serial=2 192.168.1.205:4500->121.133.8.18:4500 lgwy=dyn tun=intf mode=auto bound_if=4 proxyid_num=1 child_num=0 refcnt=7 ilast=0 olast=0 stat: rxp=41 txp=56 rxb=4920 txb=3360 dpd: mode=active on=1 idle=5000ms retry=3 count=0 seqno=696 natt: mode=keepalive draft=32 interval=10 remote_port=4500 proxyid=P2_60C_Fortinet proto=0 sa=1 ref=2 auto_negotiate=0 serial=1 src: 0:182.40.101.0/255.255.255.0:0 dst: 0:100.100.100.0/255.255.255.0:0 connection issues, SA: ref=3 options=0000000d type=00 soft=0 mtu=1428 expire=1106 replaywin=0 seqno=15 life: type=01 bytes=0/0 timeout=1777/1800, dec: spi=29a26eb6 esp=3des key=24 bf25e69df90257f64c55dda4069f01834cd0382fe4866ff2 ah=sha1 key=20 38b2600170585d2dfa646caed5bc86d920aed7ff. This may or may not indicate problems with the VPN tunnel, or dialup client. If this appears to be the case, configure a DHCP relay service to enable DHCP requests to be relayed to a DHCP server on or behind the FortiGate server. Similar to the Phase-1 command, you can list the Phase-2 information about the tunnel. By default hardware offloading is used. Attempt to use the VPN or set up the VPN tunnel and note the debug output. During the connecting phase, the FortiGate will also verify that the remote users antivirus software is installed and up-to-date. This is because they require diagnose CLI commands. If the ping or traceroute fail, it indicates a connection problem between the two ends of the tunnel. The Fortinet Cookbook contains examples of how to integrate Fortinet products into your network and use features such as security profiles, wireless networking, and VPN. (Edit: That was back in August of 2021 and the big scanning ended around two weeks after it has started. View the table below for some assistance in analyzing the debug output. Using the Cookbook, you can go from idea to execution in simple steps, configuring a secure network for better productivity with reduced risk. Set up the commands to output the VPN handshaking. The output shows what you would see if there was some filter set. On some FortiGate units, such as the FortiGate 94D, you cannot ping over the IPsec tunnel without first setting a source-IP. Notify me of follow-up comments by email. While its advertised features are powerful and exactly what I need, I can't even access the means of configuring them. diag debug app ike -1 diag debug enable. The VPN tunnel initializes when the dialup client attempts to connect. Troubleshooting Commands: Fortigate HA. The command is located in the Client installation directory: In this example, you will allow remote users to access the corporate network using an SSL VPN, connecting either by web mode using a web browser or tunnel mode using FortiClient. ; Set Listen on Interface(s) to wan1.To avoid port conflicts, set Listen on Port to 10443.; Set Restrict Access to Allow access from any host. I am going to describe some concepts of IPSec VPNs. This shows us Phase I is up. This allows you to filter a VPN to a destination of 2.2.2.2 as an example: diagnose vpn ike log-filter dst-addr4 2.2.2.2. FortiGate registration and basic settings, Verifying FortiGuard licenses and troubleshooting, Logging FortiGate traffic and using FortiView, Creating security policies for different users, Creating the Admin user, device, and policy, FortiSandbox in the Fortinet Security Fabric, Adding FortiSandbox to the Security Fabric, Adding sandbox inspection to security profiles, FortiManager in the Fortinet Security Fabric, Blocking malicious domains using threat feeds, (Optional) Upgrading the firmware for the HA cluster, Connecting the primary and backup FortiGates, Adding a third FortiGate to an FGCP cluster (expert), Enabling override on the primary FortiGate (optional), Connecting the new FortiGate to the cluster, FGCP Virtual Clustering with two FortiGates (expert), Connecting and verifying cluster operation, Adding VDOMs and setting up virtual clustering, FGCP Virtual Clustering with four FortiGates (expert), Removing existing configuration references to interfaces, Creating a static route for the SD-WAN interface, Blocking Facebook while allowing Workplace by Facebook, Antivirus scanning using flow-based inspection, Adding the FortiSandbox to the Security Fabric, Enabling DNS filtering in a security policy, (Optional) Changing the FortiDNS server and port, Enabling Content Disarm and Reconstruction, Preventing certificate warnings (CA-signed certificate), Importing the signed certificate to your FortiGate, Importing the certificate into web browsers, Preventing certificate warnings (default certificate), Preventing certificate warnings (self-signed), Set up FortiToken two-factor authentication, Connecting from FortiClient with FortiToken, Connecting the FortiGate to FortiAuthenticator, Creating the RADIUS client on FortiAuthenticator, Connecting the FortiGate to the RADIUS server, Site-to-site IPsec VPN with two FortiGate devices, Authorizing Branch for the Security Fabric, Allowing Branch to access the FortiAnalyzer, Desynchronizing settings for Branch (optional), Site-to-site IPsec VPN with overlapping subnets, Configuring the Alibaba Cloud (AliCloud) VPN gateway, SSL VPN for remote users with MFA and user sensitivity. At the conclusion of phase 2 each peer will be ready to pass data plane traffic through the VPN. When ESP provides authentication functions, it uses the same algorithms as AH, but the coverage is different. You can use the diagnose vpn tunnel list command to troubleshoot this. Since last week, we observed a lot of failed SSL-VPN login events on various FortiGate setups. To allow VPN traffic between the Edge tunnel interface and the Branch tunnel interface, go to VPN > IPsec Tunnels, and edit the VPN tunnel. This recipe is in the Basic FortiGate network collection. The FortiGate can send a GRE keepalive response to a Cisco device to detect a GRE tunnel. It is possible to identify a PSK mismatch using the following combination of CLI commands: diag vpn ike log filter name diag debug app ike -1 diag debug enable. Open the packet capture that is taken from initiator FortiGate using Wireshark. However if not: Have you ever installed a Windows server to do Full Story, Why would you need to export the private key Full Story, I had a customer that installed a wildcard certificate Full Story, 2021 InfoSec Monkey | Design by Fitser, Route-Based VPN between Cisco Router and Fortigate Firewall using OSPF. Configuring the SSL VPN tunnel. Phase II Selectors not matching (you will see this next). Troubleshooting Commands: Fortigate HA. Remove any Phase 1 or Phase 2 configurations that are not in use. Now lets set a filter for the dst-addr4and enter the IP address of the peer. If the endpoint is not managed by EMS, proceed to step 2. For example, on some models the hardware switch interface used for the local area network is called lan, while on other units it is called internal. If you have determined that your VPN connection is not working properly through Troubleshooting on page 223, the next step is to verify that you have a phase2 connection. See Troubleshooting GRE over IPsec on page 235. Transport Mode Transport Mode provides a secure connection between two endpoints as it encapsulates IPs payload. The plethora of vendors that resell hardware but have zero engineering knowledge resulting in the wrong hardware or configuration being deployed is a major pet peeve of Michael's. If traffic is not passing through the FortiGate unit as you expect, ensure the traffic does not contain IPcomp packets (IP protocol 108, RFC 3173). If you have multiple dial-up IPsec VPNs, ensure that the peer ID is configured properly on the FortiGate and that clients have specified the correct local ID. Install a telnet or SSH client such as putty that allows logging of output l Ensure that the admin interface supports your chosen connection protocol so you can connect to your FortiGate unit admin interface. Pre-shared Key authentication is successful. As with the LAN connection, confirm the VPN tunnel is established by checking Monitor > IPsec Monitor. Finally the error telling you no matching Phase II found. Use the FortiGate VPN Monitor page to see whether the IPsec tunnel is up or can be brought up. ; Set the User Type to Local User and click Next. Check that the encryption and authentication settings match those on the Cisco device. Select Show More and turn on Policy-based IPsec VPN. If you are using FortiClient, ensure that your version is compatible with the FortiGate firmware by reading the FortiOS Release Notes. Start an SSH or Telnet session to your FortiGate unit. This may or may not indicate problems with the VPN tunnel. The first diagnostic command worth running, in any IPsec VPN troubleshooting situation, is Above you can see the different filtering criteria. The table below is a list of common L2TP over IPsec VPN problems and the possible solutions. Ensure that your FortiGate unit is in NAT/Route mode, rather than Transparent. If you do not know the other ends settings enable or disable XAuth on your end to see if that is the problem. AH provides data integrity, data origin authentication, and an optional replay protection service. Here we can see the platform connecting to/from. Check the following IPsec parameters: l The mode setting for ID protection (main or aggressive) on both VPN peers must be identical. The resulting output should include something similar to the following, where blue represents the remote VPN device, and green represents the local FortiGate. Alternatively, you can enter netplwiz. A mismatch could occur for many reasons, one of the most common is the instability of an ISP link (ADSL, Cable), or it could effectively be any device in the physical connection. In the event that each GRE tunnel endpoint has keepalive enabled, firewall policies allowing GRE are required in both directions. Ensure that both ends use the same P1 and P2 proposal settings (seeThe SA proposals do not match (SA proposal mismatch) below). For more information, see Feature visibility. The output will show packets coming in from the GRE interface going out of the interface that connects to the protected network (LAN) and vice versa. Uninstalling FortiClient. If you want multicast traffic to traverse the GRE tunnel, you need to configure a multicast policy as well as enable multicast forwarding. I am not focused on too many memory, process, kernel, etc. Proposal mismatch. If routing is the problem, the proposal will likely setup properly but no traffic will flow. The error saying that the Phase II selector was the issue. This configuration adds two-factor authentication (2FA) to the split tunnel configuration (SSL VPN split tunnel for remote user).It uses one of the two free mobile FortiTokens that is already installed on the FortiGate. If preshared keys are being used for authentication purposes, both VPN peers must have identical preshared keys. This kind of information in the resulting output can make all the difference in determining the issue with the VPN. Select Attempt to detect/decode encrypted ESP payloads, and fill in the information for the encryption algorithm and the keys. If the endpoint is not managed by EMS, proceed to step 2. The Fortinet Cookbook contains examples of how to integrate Fortinet products into your network and use features such as security profiles, wireless networking, and VPN. If its too slow, the connection may timeout before completing. If your VPN tunnel goes down often, check the Phase 2 settings and either increase the Keylife value or enable Autokey Keep Alive. Initiator shows the remote unit is sending the first message. If your FortiGate unit is behind a NAT device, such as a router, configure port forwarding for UDP ports 500 and 4500. Stop any diagnose debug sessions that are currently running with the CLI command diagnose debug disable, Clear any existing log-filters by running. Check routing. Reenter the preshared key. See Troubleshooting GRE over IPsec on page 235. ESP can be used with confidentiality only, authentication only, or both confidentiality and authentication. You can use the diagnose, If XAUTH is enabled, ensure that the settings are the same for both ends, and that the FortiGate unit is set to. Fortinet GURU is not owned by or affiliated with, Click to share on Twitter (Opens in new window), Click to share on Facebook (Opens in new window), Click to share on LinkedIn (Opens in new window), Click to share on Tumblr (Opens in new window), Click to share on Reddit (Opens in new window), Check Out The Fortinet Guru Youtube Channel, Logging violations of the MAC address learning limit (480808), Collectors and Analyzers FortiAnalyzer FortiOS 6.2.3, High Availability FortiAnalyzer FortiOS 6.2.3, Two-factor authentication FortiAnalyzer FortiOS 6.2.3, Global Admin GUI Language Idle Timeout FortiAnalyzer FortiOS 6.2.3, Global Admin Password Policy FortiAnalyzer FortiOS 6.2.3, Global administration settings FortiAnalyzer FortiOS 6.2.3, SAML admin authentication FortiAnalyzer FortiOS 6.2.3, If there are more than one preshared key dial-up VPN with the same local gateway, use, Error: connection expiring due to XAUTH failure, Check user credentials and user group configuration, Error: peer has not completed XAUTH exchange, Route or firewall policy misconfiguration, Route-based: traffic must be routed to IPsec virtual interface Policy-based: traffic must match a. NPU offloading is supported when the local gateway is a loopback interface. If the egress/outgoing interface (determined by kernel route) has an IP address, then use the IP address of the egress/outgoing interface. yes it was the filter. Session is attached to local fortigate ip stack. You may need static routes on both ends of the tunnel. Verify the configuration of the FortiGate unit and the remote peer. Alert email can be configured to report L2TP errors. This will allow you to review the data later on at your own speed without worry about missed data as the diag output scrolls by. Routing problems may be affecting DHCP. Here we can see the first ISKMP proposal the firewall received. spi=c32b09f7 seq=00000012. Using zones to simplify firewall policies, (Optional) Configuring SD-WAN Status Check, Allowing traffic from the internal network to the SD-WAN interface, Fortinet Security Fabric installation and audit, (Optional) Adding security profiles to the Security Fabric, Configuring a traffic shaper to limit bandwidth, Verifying your Internet access security policy, Configuring your FortiGate for NGFW policy-based mode, Creating an IPv4 policy to block Facebook, Creating a high priority VoIP traffic shaper, Creating a low priority FTP traffic shaper, Creating a medium priority daily traffic shaper, Adding a VoIP security profile to your Internet access policy, Adding a FortiToken to the FortiAuthenticator, Adding the user to the FortiAuthenticator, Creating the RADIUS client on the FortiAuthenticator, Connecting the FortiGate to the RADIUS server, SAML 2.0 FSSO with FortiAuthenticator and Centrify, Configuring DNS and FortiAuthenticator'sFQDN, Enabling FSSOand SAML on the FortiAuthenticator, Adding SAML connector to Centrify for IdPmetadata, Importing the IdP certificate and metadata on the FortiAuthenticator, Uploading the SP metadata to the Centrify tenant, Configuring Captive Portal and security policies, SAML 2.0 FSSO with FortiAuthenticator and Google G Suite, Configuring FSSO and SAML on the FortiAuthenticator, Importing the IdPcertificate and metadata on the FortiAuthenticator, SAML 2.0 FSSO with FortiAuthenticator and Okta, Configuring the Okta developer account IDP application, Importing the IDP certificate and metadata on the FortiAuthenticator, (Optional) Upgrading the firmware for the HAcluster, Connecting the primary and backup FortiGates, FGCP Virtual Clustering with two FortiGates (expert), Connecting and verifying cluster operation, Adding VDOMs and setting up virtual clustering, FGCP Virtual Clustering with four FortiGates (expert), Troubleshooting the initial cluster configuration, Verifying the cluster configuration from the GUI, Troubleshooting the cluster configuration from the GUI, Verifying the cluster configuration from the CLI, Troubleshooting the cluster configuration from the CLI, Using FGSP to load balance access to two active-active data centers, Configuring the second FortiGate (Peer-2), Configuring the fourth FortiGate (Peer-4), Enabling Web Filtering and Application Control, Edit the default Application Control profile, FortiManager in the Fortinet Security Fabric, Allowing FortiManager to have Internet access, FortiSandbox in the Fortinet Security Fabric, Adding sandbox inspection to security profiles, Using the default deep-inspection profile, Creating an SSL/SSH profile that exempts Google, Transparent web filtering using a virtual wire pair, Configure the virtual wire pair policy and enable web filtering, Preventing certificate warnings (CA-signed certificate), Importing the signed certificate to your FortiGate, Importing the certificate into web browsers, Preventing certificate warnings (default certificate), Preventing certificate warnings (self-signed), Allowing Branch to access the FortiAnalyzer, (Optional) Using local logging for Branch, Site-to-site IPsec VPN with certificate authentication, Site-to-site IPsec VPN with two FortiGates, Configuring the HQ multicast policy and phase 2 settings, Configuring the Branch multicast policy and phase 2 settings, Client-Side SD-WAN with IPsec VPN Deployment Scenario (Expert), Creating the data center side of the IPsec VPN, Adding addresses to the tunnel interfaces, Controlling access to data center networks, Pointing to branch offices with black hole routes, Creating the branch side of the IPsec VPN, Adding IP addresses to the tunnel interfaces, Setting up the load balancing SD-WAN configuration, Creating and customizing the Remote Office tunnel, Connecting and authorizing the FortiAPunit, Dual-band SSID with optional client load balancing, FortiConnect guest on-boarding using RSSO, Registering the WLC as a RADIUS client on the FortiConnect, Registering the FortiGate as a RADIUS accounting server on the FortiConnect, Validating the WLC configuration created from FortiConnect, Creating the wireless ESSprofile on the WLC, Enabling RADIUS accounting listening on the FortiGate, Configuring the RSSOAgent on the FortiGate, FortiConnect as a RADIUS server in FortiCloud, Configuring FortiCloud to access FortiConnect, Configuring FortiCloud as a RADIUS client on FortiConnect, Configuring FortiConnect as a RADIUS server on FortiCloud. 1) Configure the VPN Interface but not from IPsec Wizard as the interface created from IPsec wizard cannot be called in the SD-WAN member or to be precise when the tunnel is created from IPsec wizard it creates routes, policy, addresses, etc. On the Windows system, Start an elevated command line prompt. Rashmi Bhardwaj If it is a PSK mismatch, you should see something similar to the following output: ike 0:TRX:322: PSK auth failed: probable pre-shared key mismatch ike Negotiate SA Error: The most common problem with IPsec VPN tunnels is a mismatch between the proposals offered between each party. Check the routing behind the dialup client. Quick-Tips are short how tos to help you out in day-to-day activities. details. protocol = IKEv2: encapsulation = IKEv2/none type=ENCR, val=3DES_CBC. FW-01 # get vpn ipsec tunnel name VPN- gateway name: 'VPN-' type: route-based local-gateway: 199.26.76.158:0 (static) Configure the management interface. AH authenticates IP headers and their payloads, with the exception of certain header fields that can be legitimately changed in transit, such as the Time To Live (TTL) field. Phase II IKE phase 2 establishes IPSec SAs (one in each direction) for the VPN connection, and is referred to as Quick Mode. For example if 10.11.101.10 selected both Diffie-Hellman Groups 1 and 5, that would be at least 2 proposals set. And finally, Some remote firewalls such as Cisco, do not like Fortinet/Palo/Checkpoint etc groups on Phase II Selectors. FortiGate units do not allow IPcomp packets, they compress packet payload, preventing it from being scanned. If the endpoint is currently managed by EMS, do the following: The EMS administrator deregisters the endpoint. FortiGate models differ principally by the names used and the features available: Naming conventions may vary between FortiGate models. Today we will cover basic FortiGate IPsec Troubleshooting. In this scenario, you must assign an IP address to the virtual IPsec VPN interface. Using the output from Obtaining diagnose information for the VPN connection CLI, search for the word proposal in the output. This section describes some checks and tools you can use to resolve issues with the GRE-over-IPsec VPN. L2TP and diagnose debug application ike -1 diagnose debug application l2tp -1 diagnose debug enable, 2010-01-11 16:39:58 log_id=0101037127 type=event subtype=ipsec pri=notice vd=root msg=progress IPsec Phase 1 action=negotiate rem_ip=172.20.120.151 loc_ip=172.20.120.141 rem_port=500 loc_port=500 out_ intf=port1 cookies=5f6da1c0e4bbf680/d6a1009eb1dde780 user=N/A group=N/A xauth_user=N/A xauth_ group=N/A vpn_tunnel=dialup_p1 status=success init=remote mode=main dir=outbound stage=1 role=responder result=OK, 2010-01-11 16:39:58 log_id=0101037127 type=event subtype=ipsec pri=notice vd=root msg=progress IPsec Phase 1 action=negotiate rem_ip=172.20.120.151 loc_ip=172.20.120.141 rem_port=500 loc_port=500 out_ intf=port1 cookies=5f6da1c0e4bbf680/d6a1009eb1dde780 user=N/A group=N/A xauth_user=N/A xauth_ group=N/A vpn_tunnel=dialup_p1 status=success init=remote mode=main dir=outbound stage=2 role=responder result=OK, 2010-01-11 16:39:58 log_id=0101037127 type=event subtype=ipsec pri=notice vd=root msg=progress IPsec Phase 1 action=negotiate rem_ip=172.20.120.151 loc_ip=172.20.120.141 rem_port=500 loc_port=500 out_ intf=port1 cookies=5f6da1c0e4bbf680/d6a1009eb1dde780 user=N/A group=N/A xauth_user=N/A xauth_ group=N/A vpn_tunnel=dialup_p1 status=success init=remote mode=main dir=inbound stage=3 role=responder result=DONE, 2010-01-11 16:39:58 log_id=0101037127 type=event subtype=ipsec pri=notice vd=root msg=progress IPsec Phase 1 action=negotiate rem_ip=172.20.120.151 loc_ip=172.20.120.141 rem_port=500 loc_port=500 out_ intf=port1 cookies=5f6da1c0e4bbf680/d6a1009eb1dde780 user=N/A group=N/A xauth_user=N/A xauth_ group=N/A vpn_tunnel=dialup_p1_0 status=success init=remote mode=main dir=outbound stage=3 role=responder result=DONE, 2010-01-11 16:39:58 log_id=0101037129 type=event subtype=ipsec pri=notice vd=root msg=progress IPsec Phase 2 action=negotiate rem_ip=172.20.120.151 loc_ip=172.20.120.141 rem_port=500 loc_port=500 out_ intf=port1 cookies=5f6da1c0e4bbf680/d6a1009eb1dde780 user=N/A group=N/A xauth_user=N/A xauth_ group=N/A vpn_tunnel=dialup_p1_0 status=success init=remote mode=quick dir=outbound stage=1 role=responder result=OK, 2010-01-11 16:39:58 log_id=0101037133 type=event subtype=ipsec pri=notice vd=root msg=install IPsec SA action=install_sa rem_ip=172.20.120.151 loc_ip=172.20.120.141 rem_port=500 loc_port=500 out_ intf=port1 cookies=5f6da1c0e4bbf680/d6a1009eb1dde780 user=N/A group=N/A xauth_user=N/A xauth_ group=N/A vpn_tunnel=dialup_p1_0 role=responder in_spi=61100fe2 out_spi=bd70fca1, 2010-01-11 16:39:58 log_id=0101037139 type=event subtype=ipsec pri=notice vd=root msg=IPsec Phase 2 status change action=phase2-up rem_ip=172.20.120.151 loc_ip=172.20.120.141 rem_port=500 loc_port=500 out_intf=port1 cookies=5f6da1c0e4bbf680/d6a1009eb1dde780 user=N/A group=N/A xauth_user=N/A xauth_group=N/A vpn_tunnel=dialup_p1_0 phase2_name=dialup_p2, 2010-01-11 16:39:58 log_id=0101037138 type=event subtype=ipsec pri=notice vd=root msg=IPsec connection status change action=tunnel-up rem_ip=172.20.120.151 loc_ip=172.20.120.141 rem_port=500 loc_port=500 out_intf=port1 cookies=5f6da1c0e4bbf680/d6a1009eb1dde780 user=N/A group=N/A xauth_ user=N/A xauth_group=N/A vpn_tunnel=dialup_p1_0 tunnel_ip=172.20.120.151 tunnel_id=1552003005 tunnel_type=ipsec duration=0 sent=0 rcvd=0 next_stat=0 tunnel=dialup_p1_0, 2010-01-11 16:39:58 log_id=0101037129 type=event subtype=ipsec pri=notice vd=root msg=progress IPsec Phase 2 action=negotiate rem_ip=172.20.120.151 loc_ip=172.20.120.141 rem_port=500 loc_port=500 out_ intf=port1 cookies=5f6da1c0e4bbf680/d6a1009eb1dde780 user=N/A group=N/A xauth_user=N/A xauth_ group=N/A vpn_tunnel=dialup_p1_0 status=success init=remote mode=quick dir=inbound stage=2 role=responder result=DONE, 2010-01-11 16:39:58 log_id=0101037122 type=event subtype=ipsec pri=notice vd=root msg=negotiate IPsec Phase 2 action=negotiate rem_ip=172.20.120.151 loc_ip=172.20.120.141 rem_port=500 loc_port=500 out_ intf=port1 cookies=5f6da1c0e4bbf680/d6a1009eb1dde780 user=N/A group=N/A xauth_user=N/A xauth_ group=N/A vpn_tunnel=dialup_p1_0 status=success role=responder esp_transform=ESP_3DES esp_auth=HMAC_ SHA1, 2010-01-11 16:39:58 log_id=0103031008 type=event subtype=ppp vd=root pri=information action=connect status=success msg=Client 172.20.120.151 control connection started (id 805), assigned ip 192.168.0.50, 2010-01-11 16:39:58 log_id=0103029013 type=event subtype=ppp vd=root pri=notice pppd is started, 2010-01-11 16:39:58 log_id=0103029002 type=event subtype=ppp vd=root pri=notice user=user1 local=172.20.120.141 remote=172.20.120.151 assigned=192.168.0.50 action=auth_success msg=User user1 using l2tp with authentication protocol MSCHAP_V2, succeeded, 2010-01-11 16:39:58 log_id=0103031101 type=event subtype=ppp vd=root pri=information action=tunnel-up tunnel_id=1645784497 tunnel_type=l2tp remote_ip=172.20.120.151 tunnel_ip=192.168.0.50 user=user1 group=L2TPusers msg=L2TP tunnel established. FortiGate models differ principally by the names used and the features available: Naming conventions may vary between FortiGate models. FortiGate Next Generation Firewall utilizes purpose-built security processors and threat intelligence security services from FortiGuard labs to deliver top-rated protection and high performance, including encrypted traffic. ; Select Test Connectivity to be sure you can connect to the RADIUS server. Attempt to use the VPN and note the debug output in the SSH or Telnet session. In this output, we do not see a specific PFS error, but normally in Phase II these are the following situations you will find: In route-based VPNs we normally use 0.0.0.0/0 as the Phase II selectors. The Fortinet Cookbook contains examples of how to integrate Fortinet products into your network and use features such as security profiles, wireless networking, and VPN. Tag: firewall, Security. This section contains tips to help you with some common challenges of IPsec VPNs. Establishing the connection in this manner means the local FortiGate will have its configuration information as well as the information the remote computer sends. Not all FortiGates have the same features, particularly entry-level models (models 30 to 90). Port 1 is the management interface. Make sure that both VPN peers have at least one set of proposals in common for each phase. The most common IPsec VPN issues are listed below. nlb. If you want to bounce a particular VPN Tunnel run the following command, dia vpn ike gateway flush name %Tunnel-Name%. See General troubleshooting tips on page 231. Log into the CLI as admin with the output being logged to a file. l Check that a static route has been configured properly to allow routing of VPN traffic. There are two Fortigate HA modes available: Active / Passive- Configuration of primary and secondary devices are in synchronisation. Please read thoroughly and note that, although the list is extensive, it is not exhaustive. Cisco would make you create separate Phase II selectors. Connecting the FortiGate to the RADIUS server. Because you have installed FSSSO in advanced mode, you need to configure LDAP to use with FSSO. Configure FortiGate units on both ends for interface VPN l Record the information in your VPN Phase 1 and Phase 2 configurations for our example here the remote IP. When I started doing VPN way back and there were filters set up, I would be dumbfounded at why I was not receiving any traffic from a particular gateway. When an IPsec VPN tunnel is up, but traffic is not able to pass through the tunnel, Wireshark (or an equivalent program) can be used to determine whether there is an encryption mismatch. Save my name, email, and website in this browser for the next time I comment. Ensure that you have allowed inbound and outbound traffic for all necessary network services, especially if services such as DNS or DHCP are having problems. Furthermore, in circumstances where multiple remote dialup VPN tunnels exist, each tunnel must have a peer ID set. Quick mode consists of 3 messages sent between peers (with an optional 4th message). Using the Cookbook, you can go from idea to execution in simple steps, configuring a secure network for better productivity with reduced risk. All messages in phase 2 are secured using the ISAKMP SA established in phase 1. The remote client must have at least one set of Phase 1 encryption, authentication, and Diffie-Hellman settings that match corresponding settings on the FortiGate unit. Usually they are quick easy commands to make your day brighter and help you finish up quicker so you can enjoy family, friends, and libations. If DNS is working, you can use domain names. The ESP packet invalid error is due to an encryption key mismatch after a VPN tunnel has been established. In general, begin troubleshooting an IPsec VPN connection failure as follows: General troubleshooting tips. ; Optionally, configure the contact If your VPN fails to connect, check the following: If you are still unable to connect to the VPN tunnel, run the following diagnostic command in the CLI: diagnose debug application ike -1 diagnose debug enable. Tag: firewall, Security. Additionally, a particular feature may be available only through the CLI on some models, while that same feature may be viewed in the GUI on other models. Essentially, you would see 10.x.x.x/24 on one side but the other configured as 192.168.0.0/24 as an example. A number of features on these models are only available in the CLI. Go to Edit > Preferences, expand Protocol and look for ESP. Using the Cookbook, you can go from idea to execution in simple steps, configuring a secure network for better productivity with reduced risk. Ensure that VPN is enabled before logon to the FortiClient Settings page. Here we can see that Quick-Mode has failed. Check the logs to determine whether the failure is in Phase 1 or Phase 2. I have created a VPN in my lab and I will break it at different points and identify it on the output of the debug commands. A successful negotiation proposal will look similar to, IPsec SA connect 26 10.12.101.10->10.11.101.10:500 config found created connection: 0x2f55860 26 10.12.101.10->10.11.101.10:500 IPsec SA connect 26 10.12.101.10->10.11.101.10:500 negotiating no suitable ISAKMP SA, queuing quick-mode request and initiating ISAKMP SA negotiation initiator: main mode is sending 1st message, cookie 3db6afe559e3df0f/0000000000000000 out [encryption], sent IKE msg (ident-i1send): 10.12.101.10:500->10.11.101.10:500, len=264, id=3db6afe559e3df0f/0000000000000000. This section shows it is receiving AES 128 with a Hash of SHA 256, Shows that we matched a particular VPN we have configured and it matches what I created. FortiGate models differ principally by the names used and the features available: If you believe your FortiGate model supports a feature that does not appear in the GUI, go to System >Feature Visibility and confirm that the feature is enabled. This section describes some checks and tools you can use to resolve issues with L2TP-over-IPsec VPNs. If the packet was encrypted correctly using the correct key, then the decryption will be successful and it will be possible to see the original package as shown below: Repeat the decryption process for the packet capture from the recipient firewall. get system ha status > IPSec VPN Configuration: Fortigate Firewall. Otherwise, use the IP address of the first interface from the interface list (that has an IP address). diagnose debug app ike 255 diagnose debug enable. 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