We have established a point-to-point VPN tunnel over the Internet (DSL connections) between a central office and a remote office using a pair of 1721 routers with VPN cards.
I have been able to configure and activate the VPN tunnel (so far so good) and am able to connect to most hosts (via IP) at the central office.
However, we are using Winterms (Wyse 3235s) at the remote office that need to connect to a Microsoft Windows 2000 Terminal Server located at the central office. When the Winterm attempts the connection to the Terminal Server, it fails with an error message of "Unable to Connect To Server". I did a packet trace on the Terminal Server and there are about 16 packets that make it through the tunnel from the remote Winterm to the main office . However, apparently something is preventing the connection from being able to be fully established. I am able to ping the Winterm from the Terminal Server in the main office.
I am able to establish an RDP session from a laptop on the remote network to the Terminal Server and it seems to operate just fine.
So, my questions are as follows:
(1) Does anyone know of a reason that a Winterm would not be able to successfully communicate (via RDP) with a Terminal Server on the other side of a VPN tunnel?
(2) Why would a laptop at the remote office be able to successfully connect to the main office Terminal Server (via RDP) through the VPN tunnel but a Winterm (connected to the exact same hub) can not?
(3) Do I need to configure a GRE tunnel instead of a Point-To-Point tunnel?
(4) Any suggestions on things to look at, diagnostics tests, etc.?
Thanks in advance.
Mike Pung
