How to Fix VPN Tunnel Failure on Avaya Phone

If you are facing “VPN Tunnel Failure Avaya” issue in Avaya Derkphone which is on Remote Location but the IP management is managed by me in the different location, then you are in right place.

Here, we are discussing about this issue in details and providing some recommended methods/procedures to fix this problem. Let’s starts the discussion.

What is “VPN Tunnel Failure Avaya” Issue?

It is common error reported by numerous users that is categorised as VPN errors. One user reported that “I am working on Avaya IP Office v9.0 with 9608G VoIP phones. I have two locations using pfsence to connect via OpenVPN Tunnels. Everything seems to be working fine except the Avaya phones will not fully connect. They were able to connect to web server to update , but nothing past trying to login. Any help is appreciated.”

Furthermore, they explained that when they open the phone its asking for username & password twice and after entering the right user ID & password for two times its displaying VPN tunnel failure.  They have been having the random drops using an Avaya phone connecting via IPsec remote access. Sometimes when the phone drops, they notice VPN Tunnel Failure. One user explained that this problem might occur due to Firmware levels outdated Firmware, VoIP, Firewalls, etc.

[Tips & Tricks] How to Fix VPN Tunnel Failure Avaya problem?

Procedure 1: Check the following

Step 1: Ensure your have latest updates for all the devices in the call path

Step 2:  Configuration particularly if NAT is involved in the call path, configuration of various devices may be a problem. Check if all the devices are configured appropriately for your environment.

Procedure 2: Check the type of VPN connection

Step 1: Open “Network Connections”

Step 2: Right-click on your VPN server and open its “Properties”

Step 3: Go to “Security > Type of VPN”

Step 4: Select the appropriated type from the drop-down and update it

Procedure 3:  Server details

In most of the cases, “VPN Tunnel Failure Avaya” problem occurs due to incorrect server details. This is the user enters VPN details to client-side and it doesn’t match with the server-side details. So, VPN is unable to connect to the valid server and this ends up in VPN error 800. To fix this issue, we recommended you to double-check the server name, address and other details

Procedure 4: Network connections errors

For those who are not aware, VPN always required valid connection between the client and the server. In case of any network problem, it can lead to VPN Error 800 or VPN Tunnel Failure Avaya.

If this error is due to some temporary network errors, then trying to request after a few minutes fixes the error. We also recommended you to check if the error is at client-side error or server-side error.

Procedure 5: Firewall restrictions

VPN (Virtual Private Network) uses certain ports for tunnelling protocols. If the server firewall restricts these ports, you might face VPN Tunnel Failure or VPN Error 800. In most of the cases, VPN uses the TCP port 1723 for PPTP and IP port 47. If the protocol is L2Tp, then port is 1701. So, we always recommended you to make sure that Firewall is not restricting this port. If yes, then you need to disable Firewall for a moment and once problem fixed, you can turn the Firewall ON.

Procedure 6: Router Firmware update

In case if you are using new VPN connection and facing VPN Tunnel Failure while trying to connect to VPN server, then you need to update firmware of your router. This error makes the local router compatible with VPN. On other hand, if the basic VPN client settings, Firewall etc and are all correct. It is worth updating Router Firmware with the help of local Network administrators.


I am sure this article helped you to Fix VPN Tunnel Failure on Avaya Phone with several easy methods. You can try any methods mentioned above to fix this problem as per your technical knowledge. If you have any suggestions or queries, please write on comment box given below.

Sakshi Anant Author