With HTML Access the client system does not require any software other than a supported browser. The Horizon 7 deployment must meet certain software requirements.


Starting with version 7.0, View Agent is renamed Horizon Agent.

Browser on client systems




67, 68

Internet Explorer





60, 61

Microsoft Edge

41, 42

  • Chrome on an Android device does not support the Windows key, multiple monitors, copy and paste to the system, file transfer, printing, H.264 decoding, credential cleanup, and an external mouse. The following key and key combinations also do not work on the software keyboard: Del, Ctrl+A, Ctrl+C, Ctrl+V, Ctrl+X, Ctrl+Y, Ctrl+Z.

  • Safari on mobile device does not support an external mouse, the Windows key, multiple monitors, copy and paste to the system, file transfer, printing, H.264 decoding, and credential cleanup.

Client operating systems

Operating System



7 SP1 (32-bit and 64-bit)


8.x (32-bit and 64-bit)


10 (32-bit and 64-bit)

Mac OS X

10.12.x (Sierra)


10.13.x (High Sierra)


10 or later

Chrome OS

28.x or later


7 or later

Remote desktops

HTML Access requires Horizon Agent 7.0 or later, and supports all the desktop operating systems that Horizon 7.0 supports. For more information, see the topic "Supported Operating Systems for Horizon Agent" in version 7.0 or later of View Installation.

Pool settings

HTML Access requires the following pool settings, in Horizon Administrator:

  • The Max resolution of any one monitor setting must be 1920x1200 or higher so that the remote desktop has at least 17.63 MB of video RAM.

    If you use 3D applications or if end users use a MacBook with Retina Display or a Google Chromebook Pixel, see Screen Resolution.

  • The HTML Access setting must be enabled.

Configuration instructions are provided in Prepare Desktops, Pools, and Farms.

Connection Server

Connection Server with the HTML Access option must be installed on the server.

When you install the HTML Access component, 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.

Security Server

The same version as Connection Server must be installed on the security server.

If client systems connect from outside the corporate firewall, use a security server. With a security server, client systems do not require a VPN connection.


A single security server can support up to 800 simultaneous connections to Web clients.

Third-party firewalls

Add rules to allow the following traffic:

  • Servers (including security servers, Connection Server instances, and replica servers): inbound traffic to TCP port 8443.

  • Remote desktop virtual machines: inbound traffic (from servers) to TCP port 22443.

Display protocol for Horizon

VMware Blast

When you use a Web browser to access a remote desktop, the VMware Blast protocol is used rather than PCoIP or Microsoft RDP. VMware Blast uses HTTPS (HTTP over SSL/TLS).