Re: authentication problems - Mailing list pgsql-admin

From Nick Fankhauser
Subject Re: authentication problems
Date
Msg-id NEBBLAAHGLEEPCGOBHDGCEKBDLAA.nickf@ontko.com
Whole thread Raw
In response to authentication problems  (Russ McBride <Russ@psyex.com>)
Responses Re: authentication problems
List pgsql-admin
Russ-

You've got a real poser there... our system works fine with the same lines
in pg_hba. I think that means you may find your answer in the operating
system environment instead of the postgres setup.

> local     all                                   trust
> host      all   127.0.0.1    255.255.255.255    trust

> Also, I don't understand what's special about the above numbers
> (127.0.0.1 and it's mask) such that they are used to allow any ips to
> come in from the same machine.

The explanation may be a clue to the problem. 127.0.0.1 is universally
reserved and recognized to mean "this machine", but this is not hard-coded
in the networking programs, so most systems will have lines in the IP
configuration files equating localhost to 127.0.0.1. For instance, your
etc/hosts file should have an entry that says:

127.0.0.1   localhost

I wonder if this line, or something like it in your system's IP
configuration is missing & hence postgres can't use localhost to reach the
the local machine. One way to test this would be to try to ping localhost &
see if it responds by telling you it is attempting to ping 127.0.0.1

If you can't ping localhost, or it doesn't resolve to 127.0.0.1, then you
know the problem is at the operating system/network level & postgres and
JDBC are probably just fine.

-Nick

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