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Problem with iptables port redirect and rh9

Hi,

I have a running smtp server on port 8025. I have setup port redirect using iptables:
iptables -t nat -A PREROUTING -p tcp --dport 25 -i eth0 -j REDIRECT --to-port 8025

That works great except when I try to connect to the server from a rh9 running machine. I have tried with 3 different machines running rh9 and they fail to connect. The error is: Connection timed out.
Connestions from rh7.3, MAC, windows are OK.

The server is also running rh9.

Any ideas?