Group policy settings for HTML Access are specified in the ADM and ADMX template files named vdm_blast.adm and vdm_blast.admx. The templates are for the VMware Blast display protocol, which is the only display protocol that HTML Access uses.

For HTML Access 4.0 and later and Horizon 7 version 7.x, the VMware Blast group policy settings are described in "VMware Blast Policy Settings" in the Configuring Remote Desktop Features in Horizon 7 document.

If you have HTML Access 3.5 or earlier and Horizon 6 version 6.2.x or earlier, the following table describes group policy settings that apply to HTML Access. In Horizon 7 version 7.x and later, more VMware Blast group policy settings are available.

Table 1. Group Policy Settings for HTML Access 3.5 or Earlier and Horizon 6 version 6.2.x or Earlier
Setting Description
Screen Blanking Controls whether the remote virtual machine can be seen from outside of Horizon 6 during an HTML Access session. For example, an administrator might use vSphere Web Client to open a console on the virtual machine while a user is connected to the desktop through HTML Access.

When this setting is enabled or not configured, and someone attempts to access the remote virtual machine from outside of Horizon 6 while an HTML Access session is active, the remote virtual machine displays a blank screen.

Session Garbage Collection Controls the garbage collection of abandoned remote sessions. When this setting is enabled, you can configure the garbage collection interval and threshold.

The interval controls how often the garbage collector runs. You set the interval in milliseconds.

The threshold determines how much time must pass after a session is abandoned before it becomes a candidate for deletion. You set the threshold in seconds.

Configure clipboard redirection Determines the direction in which clipboard redirection is allowed. Only text can be copied and pasted. You can select one of these values:
  • Enabled client to server only (That is, allow copy and paste only from the client system to the remote desktop.)
  • Disabled in both directions
  • Enabled in both directions
  • Enabled server to client only (That is, allow copy and paste only from the remote desktop to the client system.)

This setting applies to View Agent or Horizon Agent only.

When this setting is disabled or not configured, the default value is Enabled client to server only.

HTTP Service Allows you to change the secured (HTTPS) TCP port for the Blast Agent service. The default port is 22443.

Enable this setting to change the port number. If you change this setting, you must also update settings on the firewall of the affected remote desktops (where View Agent or Horizon Agent is installed).