Users can login, but not send messages

Hey,

I have installed ejabberd on ubuntu following the instructions here: http://wiki.ubuntuusers.de/ejabberd. It seems to be running fine:


> sudo ejabberdctl status
The node ejabberd@iSam is started with status: started
ejabberd 2.1.10 is running in that node


I just run it on the localhost (for testing).
Than I created 2 users. I login using pidgin for one user and tkabber for the other users, and that seems to work fine.
Now I try to send messages between the users. In tkabber, it says:


Unrecoverable Error (Remote Server Not Found)


while in pdigin it says in a popup:


Message delivery to b2 failed: (Code 404)


Thanks!