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Editorial Team
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Asked: 2026-05-16T18:20:44+00:00

I’ve a server with postgresql installed on the postgres user. When I do: su

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I’ve a server with postgresql installed on the postgres user. When I do:

su - postgres
[entering the password]
psql

I can then execute queries on the database, that works fine.

However, from my php script (running on my own account):

$dbconnection = pg_connect("host=localhost port=5432 user=postgres password=XXXXXXX ");

(password crossed out of course)

I then get the message:

PHP Warning: pg_connect(): Unable to connect to PostgreSQL server:
FATAL: password authentication failed for user "postgres" FATAL:
password authentication failed for user "postgres" in
/home/username/script.php on line 18

I tried a lot of variations on the login string, but I keep getting the same message. Any ideas how I could try to solve this?

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1 Answer

  1. Editorial Team

    What is the current configuration for pg_hba.conf? And did you set a password for the database rol “postgres” ? su – postgres is for the Linux user “postgres”, not for the database role “postgres”. If you can start psql without entering the password, it looks like pg_hba.conf uses “trust” and not “password” of even better “md5”. Or did you create a .pgpass file?

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