OCS Conferencing Issues

You get the following messages when trying to conference people MS Communicator:

The process AVMCUSvc(5896) failed to send health notifications to the MCU factory at [URL]

The process DataMCUSvc(5840) failed to send health notifications to the MCU factory at [URL]

The process AcpMcuSvc(6112) failed to send health notifications to the MCU factory at [URL]

The process IMMcuSvc(5676) failed to send health notifications to the MCU factory at [URL]

A C3P request sent to an Mcu timed-out. Conferencing requests for this Mcu type will be retried but if this error continues to occur conferencing functionality will be affected.

Solution
http://forums.microsoft.com/unifiedcommunications/ShowPost.aspx?PageIndex=1&SiteID=57&PageID=1&PostID=1878497

Go to your certificate, I used IIS and right clicked my website and hit properties, went to "Directory Security" select View cert: You need to go to "details" tab and select "edit properties" Enable all purposes for this cert needs to be ticked.

This setting needs to be on all intermedia certs and parent certs, So after you verify your purchased cert has enabled all purposes go to the "certification path" tab and work your way up the tree selecting "view cert" and checking the details on each...