Found a solution on your problem. In IPCop, enable SSH and port-forwarding. And on the external access be sure that you allow port 222. On remote location (your laptop connected to other network), type in the following:
ssh root@ipcopserver -N -L 445:localhost:445
In your webbrowser, what you need to do is type in
and there you go..
I just hope IPCop will enable remote access even without doing the SSH Tunneling.