ssh tunnell does not work!

Hi,
I'm trying to do a ssh tunnel from a machine to another, still on an ssh
server, thus connecting to machine A the user will be automatically
redirected to the ssh server on machine B.

Here my commands:
luca@machineA:~> ssh -f -N -g -L 7777:machineB:22 luca@machineB -v

but I get a "bind: Address already in use", and I don't know why, since it
happens for all ports I tried to listen on. Furthermore, when I try to
connect to machine A on the port 7777, I can see (on the console of machine
A):
debug1: channel 1: new [direct-tcpip]
channel 1: open failed: administratively prohibited: open failed

and the connection is not established. Any idea?

Thanks,
Luca
--
Luca Ferrari,
fluca1978@infinito.it


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