[horde] Horde and IMP IMAP auth

[Alain Perry]

Hi list,

I've been a long time administrator of horde on a little server.
The company owning it wants to move the installation on a more recent
server, and use that as a pretext to install a newer version of horde,
imp, and other modules.
I configured everything, and the new installation works great with all
the latest stable versions. There is however one strange problem with
login.
The installation is set-up to use IMP to login. Apache has a VHost in
the form of http://vhost.myserver.tld/ that serves the user directly
with horde stuff.
When the user tries to log in, the debug from horde (I set the verbosity
at its maximum) in /tmp/horde.log says everything is fine, and the
/horde/imp/redirect.php scripts redirects the user ... to the same login
page, with no error message of any sort.
If the user clicks on Mail in the horde "toolbar" at the bottom of the
screen, and logs in in th same way, then he can access everything ! If
he clicks on any horde modules in the toolbar at the top of the screen,
he is redirected to the corresponding horde module, if however he clicks
on the same icon in the horde toolbar at the bottom of the screen, he is
once again redirect to the horde login page with no error message...

Please find attached the log from apache concerning the redirections at
login.

Thanks for any pointers about that strange behaviour.

-- 
Alain Perry