Hi Florian,
It works for me after putting all the ihs directives within <virtualhost>my connections Server </virtualhost>. The documentation says :
"Find the following two lines:
LoadModule was_ap22_module /opt/IBM/WebSphere/Plugins/bin/64bits/mod_was_ap22_http.so
WebSpherePluginConfig /opt/IBM/WebSphere/Plugins/config/webserver1/plugin-cfg.xml
Copy the following lines and paste them directly after the two lines."
It does not work that way.
Regards