Open a command prompt and run:
netstat -a | findstr /i 4172
port 4172 is the PCoIP default port.
so for example if you run:
netstat -a | findstr /i 443
which would be the tomcat server used for the admin portal it will list output would look like and you see what's established
TCP 0.0.0.0:443 idsyntax:0 LISTENING
TCP 127.0.0.1:4001 idsyntax:49443 
ESTABLISHED
....
There are a few TCP/IP ports that need to be open to ensure you are receiving the best functionality of VMware View Virtual Desktops. The ports may vary depending on how you utilize the Virtual Desktop.
VMware KB: Confirming that correct TCP/IP ports are open on a VMware Horizon View Virtual Desktop
General Ports
- 32111 (TCP)
Open in both directions between your VMware View Virtual Desktop and your VMware View Client. This facilitates USB redirection between your View Client and Virtual Desktop. - 9427 (TCP)
Multimedia Redirection (MMR) is supported by View Client and View Client with Offline Desktop on certain operating systems.
Note: MMR is not required in both directions.
PCoIP Ports
- 50002 (TCP/UDP)
Used for PCoIP in a VMware View 4.0.x and later environment. This port is required for the PCoIP display protocol on the software client and must be open in both inbound and outbound directions. - 4172 (TCP/UDP)
Used for PCoIP in a VMware View 4.5 and later environment. This port is required for the PCoIP display protocol.
The port 4172 UDP must be open in both inbound and outbound directions.
The port 4172 TCP must be open in only the inbound direction.
RDP Ports
- 3389 (TCP)
This port is required for usage in a View environment where Microsoft Remote Desktop Protocol (RDP) is the preferred display protocol. This port must be open between either the View Client and the Virtual Desktop, or the VMware View Connection or security server and the Virtual Desktop.
Connection server Ports
- 4001 (TCP)
This port must be open in the outbound direction so the View agent can report its status to the connection broker it is bound to.