Blacklist DNS DC hostnames

Specify a list of domain controllers to filter out when resolving the domain controller for the agent to contact through DNS. Set this policy to prevent the agent from attempting to contact a domain controller that you know is inaccessible, for example, because it resides behind a firewall, or from contacting a domain controller that is inappropriate because of its physical location, or because it is no longer a valid domain controller for the site.

To specify a domain controller, select Enabled, then click Add and enter the fully qualified name of a domain controller. For example:

You may enter only one controller at a time. To remove a controller from the list, select it and click Remove.

This group policy modifies the dns.block setting in the agent configuration file.