I have 9427 open from my Universal Access Gateway to my Internal Network. I don't have it open from external as it's not listed as the needed ports.
Port Protocol Source Target Description
|443||TCP||Internet||Unified Access Gateway||For web traffic, Horizon Client XML - API, Horizon Tunnel, and Blast Extreme|
|443||UDP||Internet||Unified Access Gateway||UDP 443 is internally forwarded to UDP 9443 on UDP Tunnel Server service on Unified Access Gateway.|
|8443||UDP||Internet||Unified Access Gateway||Blast Extreme (optional)|
|8443||TCP||Internet||Unified Access Gateway||Blast Extreme (optional)|
|4172||TCP and UDP||Internet||Unified Access Gateway||PCoIP (optional)|
|443||TCP||Unified Access Gateway||Horizon Broker||Horizon Client XML-API, Blast extreme HTML access, Horizon Air Console Access (HACA)|
|22443||TCP and UDP||Unified Access Gateway||Desktops and RDS Hosts||Blast Extreme|
|4172||TCP and UDP||Unified Access Gateway||Desktops and RDS Hosts||PCoIP (optional)|
|32111||TCP||Unified Access Gateway||Desktops and RDS Hosts||Framework channel for USB Redirection|
|9427||TCP||Unified Access Gateway||Desktops and RDS Hosts||MMR and CDR|
You may have something blocking your secure channel.
Try setting the following regKey on agent
[HKEY_LOCAL_MACHINE\SOFTWARE\VMware, Inc.\VMware HTML5MMR]
As a side effect, the speed of pcoip side channel could be slow. You will need to restart html5server on the agent (e.g. reboot) after setting the regkey.