Yes you are correct we are using MSMQ and it should be supported by the server by default. Since the communication between the server nodes goes through HTTP port 80, please make sure that the server nodes in the web farm can communicate with each other.
Furthermore please check how the load balancing URLs are configured in the system settings. It is important that the the Licensing module can validate them. For example if my website is registered for sitefinity.com domain I am safe to use addresses such as:
http://webfarmnode1.sitefinity.com, http://webfarmnode2.sitefinity.com or the internal IP address of the server node. Note that those address should not be accessible from the outside world.
If you are using addresses such as the machine name (http://webfarmnode1), please contact our sales team so that they can issue a domain alias for all the nodes in the web farm.
the Telerik team
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