Hello Joerg,
Have you tested more than one client machine and
browser?
Do you have any proxy settings in your browser?
Do you seen a portion of the login screen or nothing at all?
is JrunProxyServer, TomCat, and Apache running normally?
If you stop the daemon manager
does the Java Plugin Console have any error messages when you try to launch the CiscoWorks GUI?
Please take a look at stdout.log and stderr.log, that should have better information to point you in the
right direction.
found in /opt/CSCOpx/objects/jrun/jsm-cw2000/logs
hope that helps