Problem Adding A PostgreSQL Server in Debian

I've installed PostgreSQL, and set it up with a user that has the same user
name and password as one of the Linux Users. I have no problem logging into
the psql terminal with the user via the command line. Once I am logged into
psql, I can execute the CREATE DATABASE and CREATE TABLE commands with no
problem.

However, when I tried to add a server in pgAdmin3 with the same user and
password, I get this error:

"An error has occurred:

Error connecting to the server: FATAL:IDENT authentication failed for user
"myuser" "

I have checked my pg_hba.conf file and everything appears to be as it
should be. (Although I'm not an expert, and I could be missing something.)
It is set up to accepts all connections from the local machine.

Do you guys have any suggestions for me? I'm thinking the problem is with
pgAdmin3, since I can connect to PostgreSQL via the psql terminal with no
problems, but I'm not sure.

I'm running the latest stable version of both PostgreSQL and pgAdmin3.

Thanks,

The Sunburned Surveyor