xwiki manager not responding to forwarded http requests

After upgrading to 3.4 and also 3.5 my xwiki is not responding to my forwarded ip (like 'http://<my_url_name>:<my_forwarded_port>/xwiki/bin/view/Main/'). Before there were no troubles. But now i just can acces subwikis (like 'http://<my_url_name>:<my_port>/xwiki/wiki/bildung/view/Main/').

I just become redirected to the url for non existing pages defined in the 'xwiki.cfg'