> The NAT-table timeout should be tunable in the router.  Set 
> it to more than a day if you do daily backups through the 
> connection. Or, enable TCP keepalives for ssh so the 
> connection will appear to have activity (ServerAliveInterval 
> on the client side or TCPKeepAlive in sshd config).

I disabled the firewall and backups proceed as desired: my 3GB file has
been transferred and stored!

Just to let everybody know...

Flavio Boniforti.

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