Domain doesn´t start

[BerndK]

We have 29 domains running in virtuozzo, one of these always is stopped in IIS and we can´t start it. The error displayed is: "no more memory(space) left for actualisation of security informations". If we stop another domain we are able start the first one. Today the domain plesk service was stopped, so we couldn´t manage the server. The microsoft technet hint to increase a registry for HEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\HTTP\Parameters\MaxEndPoints didn´t work either.
The machine has 4 GB RAM (2 GB free)

also see:
http://technet.microsoft.com/de-de/library/cc782714(WS.10).aspx

Thanks for any help

best regards
Bernd