Error after updating postgresql

Hi, after upgrade to Mandrake 9.0, I can't start my postgresql server. I
find that when I run postmaster, I get the following message:

postmaster successfully started
PGSTAT: bind(2): Cannot assign requested address

I find that this is not related, there are no program using this port.
And even if I disable using TCP I still can't setup the server. However,
if I don't run "postmaster" but run "postgres", then it is ok to start.
I have check the log file, but don't get anything logged. Anyone know why?

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