ident sameuser failure

Hi all, I have a problem that I am chasing and getting nowhere with.
Can anyone help?
I have postgresql-7.2.1-5 running as the server on a redhat7.3 box.
I am connecting from a redhat8.0 box with postgresql-7.2.2-1 using both
psql and pgaccess.
My pg_hba.conf looks like this:

local all ident sameuser
host testuserdb 192.168.0.0 255.255.255.0 ident sameuser
host testdb 192.168.0.0 255.255.255.0 password

Now the scenenario is like this:

User test can connect to database testdb with a password.
User testuser cannot connect to database testuserdb and gets these errors
psql -h workbench -d testuserdb -U testuser
psql: FATAL 1: IDENT authentication failed for user "testuser"

on the server I made (as postgres) the users test and testuser, then
became each user and created the testdb and testuserdb.

I have tried making a usermap in pg_ident.conf

testuser testuser testuser

and tried the line

host testuserdb 192.168.0.0 255.255.255.0 ident testuser

But still no change.
Testuser can connect if AUTH_TYPE is trust however.

Can anyone lend a pinch of advice that may be the problem here?
many thanks
Stephen.

Computer Concepts Limited
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