Question : Contivity VPN - Login Failed. Please consult the switch log for details.

Where is the switch log?  Is it on the server side?

Answer : Contivity VPN - Login Failed. Please consult the switch log for details.

A little more information might help a bit here.....

Normally it is held on the client but depending on the error, you may have made a partial connection so there would be a log entry server-side also.