[horde] domain change causing session problems?

[Nathan Barhorst]

I set up a horde installation on a machine and have been accessing it
via http://<ip addr>/horde and it works great.  I'm trying now to set
it up for a domain name, so I can go to http://horde.domain.com and it
should work.  I have set up the Apache Virtual host, and I go to the
login page as expected.  However, I cannot log in.  I haven't moved
machines, so I can still log into the site at http://<ip addr>/horde.
After doing some debugging in the code, it looks like the $_SESSION
variables aren't getting set on login redirect, which basically tells
me that cookies aren't being set/saved for the new domain.

Any suggestions?  I ran the http://horde.domain.com/test.php script,
and all looks fine.

Thanks!

-Nathan