Moved computers now VPN not working

The office was carpeted and the computers were moved. When reconnecting the remote user could no longer connect through Microsoft VPN connection. The previous IT person had the server on a dynamic ip which probably changed on the new hookup. How can I troubleshoot this?

use DNS if the IP is dynamic. That will do the trick.

I think it would be better to make the server a static IP. I think that it might be a routing problem. I still can’t connect either from the internal network or the public network. Any ideas?

When I try to connect through the private network, the Microsoft VPN client says: Error 800: Unable to establish the VPN connection. The VPN server may be unreachable, or security parameters may not be configured properly for this connection

I am using the current ip address and not DNS.

What should I change?

http://www.howtonetworking.com/vpnissues/error800.htm