Office Communicator Server 2007 R2 Failed to start

wingkchan used Ask the Experts™
Hi Experts,

we have an office communicator server in our office that use for Instant messaging.  It has been working well, but this afternoon people couldn't sign on.

I checked the event viewer and found this warning:

Could not establish application endpoint with OCS on
Exception: Microsoft.Rtc.Signaling.RegisterException - 504 - The endpoint was unable to register. See the ErrorCode for specific reason.
Inner Exception: ~
The service will retry every 30 seconds.

I tried to search for reference online, but couldn't find much.  Can anyone please help on explaining what might have caused this error message?  thank you very much.

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was any certificate on the web server changed/renewed/removed and added again? did you try manually starting the service in services.msc?
any application pool used by the website is in stopped state?


thanks itsmein foryour support.  actually i have no idea if the server was changed in anyway... but later another colleague fixed the issue, but i didn't get any update from him as what was the cause... haha.  I am still clueless even though it is OK now.

But just to follow up on as much as I can.  I see all services were started.  We don't use the Web component, so there was no IIS involved too.  Anyway, I apprecipate your assistance.  thanks!

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