i'm having the same problem running pg8.0.1 on redhat enterprise linux AS 3 (2.4.21-27.0.4.ELsmp).
shutting off my firewall via 'service iptables stop' solves the problem... what needs to be modified in the iptables to allow remote pg connections?
You will need to open port 5432 to TCP traffic (assuming you haven't changed the defaults).
There's almost certainly a graphical firewall configuration tool for RH Enterprise.
There are also a number of firewall projects that sit on top of the raw iptables system and make it easier to configure your firewall settings.
HTH -- Richard Huxton Archonet Ltd
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