[horde] IMP test login successful but not from horde or IMP

[Norris Ward]

Hi all,
        I am a newbie. I was having some issues so I down
graded(reinstalled) from Redhat 8 to 7.3 .  I am running the following:
*	horde 2.2.3
*	imp 3.2.1
*	kronolith 1.0-2
*	mnemo 1.1-1
*	turba 1.2-1
*	php 4.2.2-0 and sub php modules
*	imap2001a
*	redhat 7.3, apache 1.3.27, mysql
All is installed successfully.  SQL works and so does apache.  From the
/test.php page all seems to be OK.  I can then click on the link and run the
imp test and login successfully.  Now comes time to login and btw, I did
uncomment the following in the /horde/config/registry.php:
$this->registry['auth']['login'] = 'imp';
$this->registry['auth']['logout'] = 'imp';
I configure my apache comfig with an alias from /mail/ to
/var/www/html/horde/ .  I am able to get to the horde login page
successfully but then login fails.  I thought I configured everything
successfully.  Did I miss something?
Much thanks in advance...