As we are aware, XenDesktop brokering works on WCF. This is a part of the Microsoft .NET framework where the communication works on channels and activities for the VDA communication and these activities have the following timeouts defined:

Sometimes, due to these timeout settings, the VDA registration can fail and you will see the following exceptions reported on your screen: Unhandled Exception: System.TimeoutException: The open operation did not complete within the allotted timeout of 00:00:05. The time allotted to this operation may have been a portion of a longer timeout.

You will see this exception when the server registration...