This causes the IP packets to be fragmented. During IKEv2 connection establishment, payload sizes may exceed the IP Maximum Transmission Unit (MTU) for the network path between the client and server. VPN error code 809 can also be caused by IKE fragmentation when using the IKEv2 VPN protocol. On the Citrix NetScaler a “persistency group” must be defined. On the F5 BIG-IP a custom “persistence profile” must be configured. For example, on the KEMP LoadMaster the administrator will configure “port following”. This commonly requires custom configuration. For IKEv2 specifically, it is crucial that UDP ports 5 be delivered to the same backend server. Load Balancer Configuration – If VPN servers are located behind a load balancer, make certain that virtual IP address and ports are configured correctly and that health checks are passing.Make sure that any NAT rules are forwarding traffic to the correct server. Inbound TCP port 443 is required for the Secure Socket Tunneling Protocol (SSTP) and inbound UDP ports 5 are required for the Internet Key Exchange version 2 (IKEv2) protocol. Firewall Configuration – Confirm the edge firewall is configured properly. Name Resolution – Ensure the VPN server’s public hostname resolves to the correct IP address.When troubleshooting VPN error code 809 the following items should be carefully checked. Often this is related directly to network connectivity, but sometimes other factors can come in to play. The error code 809 indicates a VPN timeout, meaning the VPN server failed to respond. The error code returned on failure is 809.” “The User dialed a connection named with has failed. In addition, the Application event log records an error message with Event ID 20227 from the RasClient source. Please contact your Administrator or your service provider to determine which device may be causing the problem.” firewalls, NAT, routers, etc.) between your computer and the remote server is not configured to allow VPN connections. This could be because one of the network devices (e.g. The network connection between your computer and the VPN server could not be established because the remote server is not responding. On the Windows 10 client the error message states the following. When testing an Always On VPN connection, the administrator may encounter a scenario where the VPN client fails to connect to the VPN server.
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