|I guess, you are dealing with a DNS issue over the VPN.|
The client computer most likely uses another DNS server to resolve computer names and this DNS server is not aware of the computers at the other side of the VPN.
So you can use the ip address instead of the computer name or you have to make entries in the hosts file for these computers, or you have to make entries in the DNS server for these computers.
As I mentioned before, you can use e.g.:
The original poster should always write the last response !!!
Let us know, if the problem is solved !!!