"Add Conference Server"-dialog hangs

Hello everybody,

I installed openfire and sparkweb successfully. I can login to openfire via sparkweb.

But when I want to add a conference (switch to tab “Conferences”, click on “+”) I get a dialog “Add Conference Server”.

After inserting the openfire’s server name and clicking “Add” the dialog hangs.

What is happend and how can I avoid it?

Thanks in advance for any help.

Best regards,