Registration not possible

I set up openfire with standard installation.

Erverything is ok, when I register an account via the webinterface.

Neither with gajim, nor with Pidgin I was able to register an account.

What can I do?

Additional infos:

On my server runs additionally zimbra and funambol, perhaps this is the problem?

When I deactivate public registering and try to register via gajim; I get the correct answer: “not allowed”.

If I activate public registrations, gajim tries to register, but nothing happens. The server logs all stay empty!

What can i do?

netstat -l shows, that port 5223 is used; 5222 not.

with tkabber I am able to register. with gajim and pidgin I am not.

it gets more and more strange