Open Source Document Management System | OpenKM

Hello,
I try to configure OpenKM access via joomla but without success. Config: But when I test the connection I see the following error: The OpenKM is available via this IP/Port when I try it via browser and I can log in with this user!
Any hints?
Kind regards

put your http://ip:8080/OpenKM/ with last character /
When you click on test button, is going right or not ?

No it does not help.

Any other hint? What exactly has to be configured?
- Is there anything which has to be configured in the OpenKM system except the user?
- Is there anything in the joomla system except this "Component configuration"?
- Is there anything on the linux environment which has to be done (user rights for certain folders etc...?)
- Do you provide me an link on any documentation about installing and configuring this plugin Joomla Explorer- OpenKM except of this link which is not very detailed... http://wiki.openkm.com/index.php/Joomla_explorer

Thank you in advance
regards
Andreas

go to /var/log/apache2 -> and there should be shown some error in logs files, that will help us understanding what's happening.
In OpenKM catalina.log file is not shown any error ?