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Event ID 526 — RD Gateway Server Configuration

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Applies To: Windows Server 2008 R2

For remote clients to successfully connect to internal network resources (computers) through a Remote Desktop Gateway (RD Gateway) server, the RD Gateway server must be configured correctly. The RD Gateway server must be configured to use an appropriate Secure Sockets Layer (SSL)-compatible X.509 certificate, and authorization policy settings must be configured correctly. Remote Desktop connection authorization policies (RD CAPs) specify who can connect to the RD Gateway server. Remote Desktop resource authorization policies (RD RAPs) specify the internal network resources that clients can connect to through an RD Gateway server.

Event Details

Product: Windows Operating System
ID: 526
Source: Microsoft-Windows-TerminalServices-Gateway
Version: 6.1
Symbolic Name: AAG_EVENT_SERVICE_MESSAGE_CONFIGURE_FAILED
Message: The system message was not enabled because a failure occurred. Try enabling the system message again.

Resolve

Check configuration of the system message

A system message is displayed to users who are logged on to the remote computer. To ensure that the system message is properly configured, do the following things:

  • Ensure that the system message box is not empty.
  • Ensure that the start time is before the end time.
  • Grant the required permissions on the TSGMessaging registry key.

To perform these procedures, you must have membership in the local Administrators group, or you must have been delegated the appropriate authority.

Ensure that the service message box is not empty

Use Remote Desktop Gateway Manager to ensure that the service message box is not empty.

To ensure that the service message box is not empty:

  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, right-click the node that represents the local RD Gateway server, which is named for the computer on which the RD Gateway server is running, and then click Properties.
  3. Click the Messaging tab.
  4. Check that the Enable system message check box is selected, and that the appropriate text is entered into the box.

Ensure that the start time is before the end time

You can ensure that the start time is before the end time by using Remote Desktop Gateway Manager.

To ensure that the start time is before the end time:

  1. 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, right-click the node that represents the local RD Gateway server, which is named for the computer on which the RD Gateway server is running, and then click Properties.
  3. Click the Messaging tab.
  4. Ensure that the date and time displayed in the Start Time box is before the date and time shown in the End Time box.

Grant the required permissions on the TSGMessaging registry key

You can check the permissions on the TSGMessaging registry key by using Registry Editor.

Caution:  Incorrectly editing the registry might severely damage your system. Before making changes to the registry, you should back up any valued data.

To grant the required permissions to the TSGMessaging registry key:

  1. On the RD Gateway server, click Start, click Run, type regedit, and then press ENTER.
  2. Navigate to the HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\TerminalServerGateway\Config\Core\TSGMessaging subkey, right-click the subkey, and then click Permissions.
  3. In the Permissions for Core dialog box, under Group or user names, click SYSTEM. Under Permissions for SYSTEM, if Full control is not allowed, select the Allow check box adjacent to Full control.
  4. In the same dialog box, under Group or user names, click Administrators. Under Permissions for Administrators, if Full control is not allowed, select the Allow check box adjacent to Full control.
  5. Click OK.

Verify

To verify that the RD Gateway server is configured correctly, examine Event Viewer logs and search for the following event messages. These event messages indicate that the Remote Desktop Gateway service is running, and that clients are successfully connecting to internal network resources through the RD Gateway server.

To perform this procedure, you do not need to have membership in the local Administrators group. Therefore, as a security best practice, consider performing this task as a user without administrative credentials.

To verify that the RD Gateway server is configured correctly:

  1. On the RD Gateway server, click Start, point to Administrative Tools, and then click Event Viewer.
  2. In the Event Viewer console tree, navigate to Application and Services Logs\Microsoft\Windows\TerminalServices-Gateway, and then search for the following events:
    • Event ID 101, Source TerminalServices-Gateway: This event indicates that the Remote Desktop Gateway service is running.
    • Event ID 200, Source TerminalServices-Gateway: This event indicates that the client is connected to the RD Gateway server.
    • Event ID 302, Source TerminalServices-Gateway: This event indicates that the client is connected to an internal network resource through the RD Gateway server.

RD Gateway Server Configuration

Remote Desktop Services