Hello,
I installed Ejabberd on Debian "Out-Of-The-Box" and it worked well from the beginning. I started to configure it to my needs, which was no problem a all. I got brave an started to build an own Sign-Up-System with PHP and Shell-Scripting, which worked flawless, too. Unfortunately I had to realize, that there is no way to prevent users from altering their Vcard-Information, so I googled and found a little tweak for mod_vcard, which would perfectly solve my problem.