RDS cannot contact License server

Win2008 R2 Remote Desktop server

Win2008 R2 Licensing server

 The licensing server is active in the domain, and under RD Session Host Config on the RDS, it appears and I can choose it, but I get an error that it cannot be contacted.

 If I choose it anyway and then run ‘Licensing Diagnosis’, I get all kinds of errors about how it cannot be contacted.

 The RDS can ping the License server.  Both servers are in the same domain.

 The scope of the License server is Forest and I have added the License server into the TSLS group in all domains.

 I also delegated authority in each domain for the TSLS group to have read/write to the terminalserver attribute.

 What am I missing?

 Thanks