Required URL Check Tool
We have released the Required URL Check Tool that, when run on your session host, will show you which URLs from the required URL list are accessible and which URLs are not accessible. This tool can be found in the folder that the latest build agent is in (i.e. C:\Program Files\Microsoft RDInfra\RDAgent_1.0.2944.1200).
More information about requirements for this tool and how to use it can be found here.