Membership in the local Administrators group, or equivalent, on the RD Gateway server that you plan to configure, is the minimum required to complete this procedure. Review details about using the appropriate accounts and group memberships at

To remove members of a Remote Desktop Gateway server farm
  1. On the RD Gateway server, open Remote Desktop Gateway Manager. To open Remote Desktop Gateway Manager, click Start, point to Administrative Tools, point to Remote Desktop Services, and then click Remote Desktop Gateway Manager.

  2. In the Remote Desktop Gateway Manager console tree, click to select the node that represents your RD Gateway server, which is named for the computer on which the RD Gateway server is running.

  3. In the results pane, under Configuration Status, click View RD Gateway server farm members.

  4. In the Properties dialog box for the RD Gateway server, on the Server Farm tab, under Remote Desktop Gateway server farm status, click the RD Gateway server that you want to remove, and then click Remove.

  5. In the RD Gateway dialog box, click Yes.

  6. To remove additional RD Gateway servers, repeat steps 4 and 5 as necessary. Ensure that you repeat these steps for each server in the farm so that the list of members is the same for each server in the farm.