openmeetings doesnt stop loading

[Tess]

I have a problem with executing openmeetings. I installed openmeetings 
on linux debian. When I run the red5.sh I can connect to openmeetings 
and follow the installation. but when click on enter a room or network 
testing it doesn't stop loading. The field in the browser turns white 
and the loading icon keeps turning. What can be the cause?