A Virtual Private Network

A Virtual Private Network (VPN) makes protected connections called VPN tunnels between a local client and a remote server, usually over the Internet. VPNs can be difficult to set up and keep running due to the specialized technology involved. When a VPN connection fails, the client program reports an error message typically including a code number. Hundreds of different VPN error codes exist but only certain ones appear in the majority of cases.

Many VPN errors require standard network troubleshooting procedures to resolve:

Ensure the computer running the VPN client is connected to the Internet (or other wide area network), and that access to the outside network is working
Ensure the VPN client has correct network settings required to work with the target VPN server
Temporarily turn off the local network firewall to determine whether it is interfering with VPN communications. Some types of VPNs require certain ports to be kept open


1. VPN Error 800
"Unable to establish connection" – The VPN client cannot reach the server. This can happen if the VPN server is not properly connected to the network, the network is temporarily down, or if the server or network is overloaded with traffic. The error also occurs if the VPN client has incorrect configuration settings. Finally, the local router may be incompatible with the type of VPN being used and require a router firmware update.
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