View Agent and Horizon Client use TCP and UDP ports for network access between each other and various View server components.

During installation in Windows clients and remote desktops and RDS hosts, the installer can optionally configure Windows firewall rules to open the ports that are used by default. If you change a default port after installation, you must manually reconfigure Windows firewall rules to allow access on the updated port. See "Replacing Default Ports for View Services" in the View Installation document.

Table 1. TCP and UDP Ports Used by View Agent
Source Port Target Port Protocol Description
Horizon Client * View Agent 3389 TCP Microsoft RDP traffic to View desktops if direct connections are used instead of tunnel connections.
Horizon Client * View Agent 9427 TCP Windows Media MMR redirection and client drive redirection, if direct connections are used instead of tunnel connections.
Horizon Client * View Agent 32111 TCP USB redirection and time zone synchronization if direct connections are used instead of tunnel connections.
Horizon Client * View Agent 4172 TCP and UDP PCoIP if PCoIP Secure Gateway is not used.
Note: Because the source port varies, see the note below this table.
Browser * View Agent 22443 TCP HTML Access if direct connections are used instead of tunnel connections.
Security server, View Connection Server, or Access Point appliance * View Agent 3389 TCP Microsoft RDP traffic to View desktops when tunnel connections are used.
Security server, View Connection Server, or Access Point appliance * View Agent 9427 TCP Windows Media MMR redirection and client drive redirection when tunnel connections are used.
Security server, View Connection Server, or Access Point appliance * View Agent 32111 TCP USB redirection and time zone synchronization when tunnel connections are used.
Security server, View Connection Server, or Access Point appliance 55000 View Agent 4172 UDP PCoIP (not SALSA20) if PCoIP Secure Gateway is used.
Security server, View Connection Server, or Access Point appliance * View Agent 4172 TCP PCoIP if PCoIP Secure Gateway is used.
Security server, View Connection Server, or Access Point appliance * View Agent 22443 TCP HTML Access if Blast Secure Gateway is used.
View Agent * View Connection Server 4001, 4002 TCP JMS SSL traffic.
View Agent 4172 Horizon Client * UDP PCoIP, if PCoIP Secure Gateway is not used.
Note: Because the target port varies, see the note below this table.
View Agent 4172 View Connection Server, security server, or Access Point appliance 55000 UDP PCoIP (not SALSA20) if PCoIP Secure Gateway is used.
Note: The UDP port number that agents use for PCoIP might change. If port 50002 is in use, the agent will pick 50003. If port 50003 is in use, the agent will pick port 50004, and so on. You must configure firewalls with ANY where an asterisk (*) is listed in the table.
Table 2. TCP and UDP Ports Used by Horizon Client
Source Port Target Port Protocol Description
Horizon Client * View Connection Server, security server, or Access Point appliance 443 TCP HTTPS for logging in to View. (This port is also used for tunnelling when tunnel connections are used.)
Horizon Client * View Agent 3389 TCP Microsoft RDP traffic to View desktops if direct connections are used instead of tunnel connections.
Horizon Client * View Agent 9427 TCP Windows Media MMR redirection and client drive redirection, if direct connections are used instead of tunnel connections.
Horizon Client * View Agent 32111 TCP USB redirection and time zone synchronization if direct connections are used instead of tunnel connections.
Horizon Client * View Agent 4172 TCP and UDP PCoIP if PCoIP Secure Gateway is not used.
Note: Because the source port varies, see the note below this table.
Horizon Client * View Connection Server, security server, or Access Point appliance 4172 TCP and UDP PCoIP (not SALSA20) if PCoIP Secure Gateway is used.
Note: Because the source port varies, see the note below this table.
View Agent 4172 Horizon Client * UDP PCoIP if PCoIP Secure Gateway is not used.
Note: Because the target port varies, see the note below this table.
Security server, View Connection Server, or Access Point appliance 4172 Horizon Client * UDP PCoIP (not SALSA20) if PCoIP Secure Gateway is used.
Note: Because the target port varies, see the note below this table.
Note: The UDP port number that clients use for PCoIP might change. If port 50002 is in use, the client will pick 50003. If port 50003 is in use, the client will pick port 50004, and so on. You must configure firewalls with ANY where an asterisk (*) is listed in the table.