Ok, one of us missunderstood his wish i think.
"Has any got any idea how to wake the server up from S3-standby, when entering the webinterface?"
For me that means, if i enter "http://htpc-name/MPWebGuide", the PC is woken up by my NIC, which works fine. Ofc it takes a while until i really can access the page.
If he ment waking up the PC through the WebGuide itself, then ofc you are right i-loop.
Hope i was able to clear up what i ment
Regards, Muldini