Installation and Setup Guide

Firewall Rules for HTML Access
To allow client Web browsers to use HTML Access to make connections to security servers, View
Connection Server instances, and remote desktops, your firewalls must allow inbound traffic on certain
TCP ports.
HTML Access connections must use HTTPS. HTTP connections are not allowed.
By default, when you install a View Connection Server instance or security server, the VMware Horizon
View Connection Server (Blast-In) rule is enabled in the Windows Firewall, so that the firewall is
automatically configured to allow inbound traffic to TCP port 8443.
Table 1‑1. Firewall Rules for HTML Access
Source
Default
Source
Port Protocol Target
Default
Target
Port Notes
Client Web
browser
TCP Any HTTPS Security
server or
View
Connection
Server
instance
TCP 443 To make the initial connection to Horizon, the Web browser on
a client device connects to a security server or Horizon
Connection Server instance on TCP port 443.
Client Web
browser
TCP Any HTTPS Blast Secure
Gateway
TCP 8443 After the initial connection to Horizon is made, the Web
browser on a client device connects to the Blast Secure
Gateway on TCP port 8443. The Blast Secure Gateway must
be enabled on a security server or Horizon Connection Server
instance to allow this second connection to take place.
Blast Secure
Gateway
TCP Any HTTPS HTML
Access
agent
TCP
22443
If the Blast Secure Gateway is enabled, after the user selects
a remote desktop, the Blast Secure Gateway connects to the
HTML Access agent on TCP port 22443 on the desktop. This
agent component is included when you install Horizon Agent.
Client Web
browser
TCP Any HTTPS HTML
Access
agent
TCP
22443
If the Blast Secure Gateway is not enabled, after the user
selects a View desktop, the Web browser on a client device
makes a direct connection to the HTML Access agent on TCP
port 22443 on the desktop. This agent component is included
when you install Horizon Agent.
VMware Horizon HTML Access Installation and Setup Guide
VMware, Inc. 10