@kamleshpatil
You need internet in your service-va server. Horizon workspace documentation specifies that if you use proxy you must configure it in service-va server, exactly in /opt/vmware/horizon/..../bin/setenv.sh.
When I configured it, I could see in my proxy that this server requested information to https://catalog.horizonmanager.com/SAAS/
Best regards,
Jose Luis Gomez