Here are answers to all you questions, I hope.

The platforms are:

1)administration desktop (pc here)
Mandriva LE2005

2)servera
Debian 3.0

3)serverb
Fedora Core 3

ssh from servera to serverb (in a remote ssh shell from "pc
here") is working

ssh from serverb to severa (in a remote ssh shell from "pc
here") is not working with the error
(ssh: connect to host serverb port 22: Connection refused).

The problem is we need to move files from serverb to server
a.
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