Invalid User ID: 0

Anyone,

I am troubled on logging on to my postgresql running under Cygwin. Postmaster says, "Fatal: Invalid User ID 0" after
connecting.I 
know for sure that the username that I am using to log is existing. Thinking that having a new user will solve the
problem,I 
tried creating a new user but same error was displayed. I tried working on psql in the hope that I can connect to
postgresqlbut 
the same has occured.

I checked the Postmaster if it can determine the availability of the database in the system catalog by logging on to a
non-existing database and the Postmaster says, "Fatal: database "foo" does not exist in the system catalog". But as I
triedto 
connect to an existing database, "Invalid User ID 0" showed up. It seems to me that pgsql users' database have been
corrupted. 

BTW, postmaster started without errors.

Your guiding ideas and tips are highly appreciated.

PS. The database that I am trying to connect to is a production database working for 3 days and in a snap back-up
cannotbe 
created due to the above problem. Hope anyone of you can help.

Kumusta, Howard


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