Strange behaviour with a TCP connection

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Hi.

I have the following problem:

I have two machines being natted through a firewall. Both machines
are translated to the same public IP. The two machines have not
any filtering/natting/mangling rules. One machine has kernel 2.4.22
and the other has 2.4.21. When the 2.4.21 machine tries to make a 
connection to a certain IP address to the port 443 (https), a 
RESET is sent inmediatly from the target (yes, the connection is natted). 
When the other machine (kernel 2.4.22) tries to make the same connection 
to the same target, the connection is succesfully done. If the
machine with kernel 2.4.21 boots off 2.4.22, the problem is solved.

By the way, the firewall has not any filtering rules for those machines.

Does anyone know what could be the problem?

Thanks in advance.

-- 
Andres Roldan <aroldan@fluidsignal.com>
GPG Key-ID: 0xB29396EB

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