SSH connection is loose after few inactivity seconds

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I've just install FreeBSD 4.8, the system work fine, but I've a got a big
problem with SSH connexion (and maybe other tcp protocols).

The connection is loose after 20 or 30 seconds of inactivity.
The PC is use as ADSL gateway, and I've got the problem across the Internet
link or LAN link (the connection is loose after 10 seconds on the Internet

If there is activity on the SSH connection (if I make a ping for example),
the connection isn't loose.

Before, I use this PC with a Debian distribution, and I haven't got this

I use the default kernel.

Any ideas ?

Thank you.

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