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sage notebook server + ssh tunneling + port forwarding

I have access to a remote server through a gate computer with this command:

ssh -fN -l user -L port:host:22 gate #To Bring up the tunnel

ssh -X -p port user@localhost #To open an X session to my server

Once on the server I run sage by typing "./sage" in the installation directory. Now the questions:

1)Which are the right commands to bring up the remote notebook server?

2)What should I type in my local browser? (I suppose something like 'localhost:port', but even without launching the notebook server I get the following error:'SSH-2.0-OpenSSH_4.3 Protocol mismatch')

I tried to read the instructions and the wiki, but I confess that I am at a loss.

Thanks a lot

Giovanni