Pg_dumpall problem

Hello,

I am trying to use pg_dumpall to backup my databases, and it is failing.
The results of a attempted dumpall are below:

[postgres(at)rspde postgres]$ pg_dumpall > 020503.out
Password: psql: Password authentication failed for user 'postgres'
Password: Password: psql: Password authentication failed for user 'postgres'
Password: psql: fe_sendauth: no password supplied
Password: psql: fe_sendauth: no password supplied
Password: psql: fe_sendauth: no password supplied
Password: psql: fe_sendauth: no password supplied
Password: psql: fe_sendauth: no password supplied
Password: psql: fe_sendauth: no password supplied
Password: psql: fe_sendauth: no password supplied
Password: psql: fe_sendauth: no password supplied
Password: psql: fe_sendauth: no password supplied
Password: psql: fe_sendauth: no password supplied
Password: psql: fe_sendauth: no password supplied
Password: psql: fe_sendauth: no password supplied
Password: psql: fe_sendauth: no password supplied
Password: psql: fe_sendauth: no password supplied
Password: psql: fe_sendauth: no password supplied
Password: psql: fe_sendauth: no password supplied
Password: psql: fe_sendauth: no password supplied
Password: psql: fe_sendauth: no password supplied
Password: psql: fe_sendauth: no password supplied
Password: psql: fe_sendauth: no password supplied
Password: Connection to database '' failed.
fe_sendauth: no password supplied

pg_dump failed on , exiting
---------------------------------------------------------------------

The version of Postgresql is 7.1 and all tables have owner postgres. The
password I supply is correct.

If anyone can shed any light on this problem, it would be greatly
appreciated.

TIA,
-jim