Starting 3.5.2-RC15 Proxy Server is supported by ePMP for Flexible Licensing.
Proxy Server's IP address and port should be entered on ePMP UI in Flexible Licensing session on Tools -> Licenses Management page.
With enabled Proxy Server option on ePMP all communication between ePMP APs and Licensing Server will pass through Proxy Server.
Solutions provides secure connectivity with Licensing Server without direct APs access to Internet.