Troubleshoot Tip: VPN configured via VPN Manager fails to install with error 131 datasrc invalid an interface IP is 0

[farhanahmed]

Description	This article explains how to troubleshoot FortiManager when install validation fails with 'error: 131 datasrc' invalid an interface IP is 0 for VPN configured via VPN Manager.
Scope	FortiManager, VPN Manager.
Solution	After configuring the VPN in VPN-Manager install validation fails with the error: The reason for failure is that to newly added peer FortiGate to VPN Manager has a dynamic IP address ( i.e. mode is set to DHCP) on the interface used as VPN Interface. This can be resolved in two ways: Set public_ip in the VPN-Manager. Use Dynamic DNS on FortiGate Interface (recommended). Set public_ip in the VPN-Manager: Go under VPN-Manager -> IPSec VPN Communities, 'Right-Click' on VPN Community, Select Configure Gateways, Select the FortiGate with dynamic IP address and Select Edit: Expand 'Advanced Options' and set the 'public_ip' which is the DHCP reserved IP address of the FortiGate interface used for VPN: Interface IP address can be obtained from FortiManager -> Device Manager -> Device & Groups, Select the FortiGate -> Network -> Interfaces OR from the FortiGate -> Network -> Interfaces. Use the Install Wizard to push the config to FortiGate. Install config now does not give the error and the remote-gw IP is present: Use Dynamic DNS on FortiGate Interface: Login to the FortiGate with dynamic IP and follow the article below to configure Dynamic DNS: Technical Tip: How to configure Dynamic DNS Fortigate This can also be set in FortiManager -> Device Manager -> Device & Groups, Select the FortiGate with dynamic IP -> Network -> DNS, Enable FortiGuard DDNS, create Dynamic DNS entry, and then, push the change to the FortiGate. In FortiManager using the Install Wizard push the VPN config to the FortiGate. Install validation does not give any error. remotegw-dns has now the Domain of the interface used as the VPN interface used on the peer FortiGate. Related documents: VPN Manager DDNS Support Displaying the device database