Software Updates are installed but Status is unknown

Hai There,

I can install the software updates on the clients, but the client is not reporting back to Configmgr. I checked all these logs

* the clients have scanned, but not sent their results (by default they are batched and sent every 15 minutes) - checked Statemessage.log for "forwarded messages to MP"

* the client has issues communicating with the MP (Ccmexec.log no HTTP errors)

* the MP has issues communicating with the site server (mpcontrol.log no errors)

* the site server has not processed the state messages (statesys.log no errors)

When i install other software, there are no problems, only with windows updates and endpoint definitions.

Can anyone help me out here please, going crazy here :)

Thanks

Esther