Still have problem with connection reset

Hello

I installed fedora for the second time on a server and I still have a 
connection reset on ssh and ftp.

This time, I tested it before install anything (iptables apache php etc) and 
after 4-5 min in idle ssh has closed (connection reset).

On 7.1.2.3 8 ans 9 I have'nt this problem and only since I use fedora.

Any idea?

Thanks

Raphael

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