Error Description: The remote connection was not made because the attempted VPN tunnels failed. The VPN server might be unreachable. If this connection is attempting to use an L2TP/IPsec tunnel, the security parameters required for IPsec negotiation might not be configured properly.

Possible Cause: This error comes when the VPN tunnel type is ‘Automatic’ and the connection establishment fails for all the VPN tunnels.

 

Possible Solutions:

a> If you know which tunnel should actually be used for your deployment, try to set the ‘Type of VPN’ to that particular tunnel type on the VPN client side. This can be set by clicking the ‘Network Connections’ icon on the bottom right of the task bar, selecting your connection and right clicking the -> Properties -> Securities Tab -> under ‘Type of VPN’ select the relevant VPN tunnel type.

By creating a VPN connection with a particular tunnel type, your connection will still fail but it will give a more tunnel specific error (for example: GRE blocked for PPTP, pre-shared key error for L2TP).

 

b> This error usually occurs when the VPN server is not reachable or the tunnel establishment fails.

i. Make sure the VPN server is reachable (try to ping the server).

ii. If interested in PPTP, make sure PPTP port (TCP 1723) or GRE Port (47) is not blocked by your firewalls.

iii. If using L2TP, make sure

1. Correct pre-shared keys are present in the client.

2. L2TP port (UDP 1701) is not blocked by your firewall.

iv. If interested in IKEv2 based VPN tunnel, make sure

IKE port (UDP port 500, UDP port 4500) is not blocked.

v. If interested in SSTP based VPN Tunnel, make sure

SSTP protocol port ( tcp 443 ) is not blocked.