Event ID - 19

Event Id19
SourceMicrosoft-Windows-TerminalServices-Licensing
DescriptionOne or more TS Licensing certificates on the Terminal Services license server "%1!s!" are corrupted. The Terminal Services license server is switching to a backup certificate.
Event InformationAccording to Microsoft :
Cause :
This event is logged when one or more TS Licensing certificates on the Terminal Services license server are corrupted.
Resolution :
Check the service, and if necessary, reactivate the license server
To resolve this issue, check that the Terminal Services Licensing service remains running and that the Terminal Services license server continues to function properly. If the problem persists, reactivate the license server.
Check the Terminal Services Licensing service
To perform this procedure, you must have membership in the local Administrators group, or you must have been delegated the appropriate authority.
To check the Terminal Services Licensing service:
  1. On the license server, open the Services snap-in. To open the Services snap-in, click Start, point to Administrative Tools, and then click Services.
  2. If the User Account Control dialog box appears, confirm that the action it displays is what you want, and then click Continue.
  3. In the Services pane, right-click Terminal Services Licensing, and then click Properties.
  4. On the General tab, ensure that Startup type is set to Automatic. If it is not, click Automatic, and then click OK.
  5. Confirm that the Status column for the Terminal Services Licensing service displays Started.
  6. If necessary, right-click Terminal Services Licensing, and then click Start.
  7. Confirm that the Status column for the Terminal Services Licensing service displays Started.
Reactivate the license server
Note : The automatic reactivation method requires Internet connectivity from the computer running the TS Licensing Manager tool. Internet connectivity is not required from the license server itself. This method uses TCP/IP (TCP port 443) to connect directly to the Microsoft Clearinghouse. You can also reactivate the license server by using a Web browser or by using the telephone.
To perform this procedure, you must have membership in the local Administrators group, or you must have been delegated the appropriate authority.
To reactivate the license server automatically:
  1. On the license server, open TS Licensing Manager. To open TS Licensing Manager, click Start, point to Administrative Tools, point to Terminal Services, and then click TS Licensing Manager.
  2. If the User Account Control dialog box appears, confirm that the action it displays is what you want, and then click Continue.
  3. Ensure that the connection method for the license server is set to Automatic connection (recommended) by right-clicking the license server that you want to reactivate, and then clicking Properties. On the Connection Method tab, change the connection method if necessary, and then click OK.
  4. Right-click the license server that you want to reactivate, point to Advanced, and then click Reactivate Server. The Reactivate Server Wizard starts.
  5. On the Welcome page, click Next.
  6. On the Information Needed page, provide the requested information, including the reason for the reactivation, and then click Next.
  7. Your request to reactivate the license server is sent to the Microsoft Clearinghouse for processing, and the license server is reactivated.
  8. On the Completing the Reactivate Server Wizard page, click Finish.
Verify :
To verify that the Terminal Services license server is activated, use the TS Licensing Manager tool.
To perform this procedure, you must have membership in the local Administrators group, or you must have been delegated the appropriate authority.
To verify that the license server is activated:
  1. On the license server, open TS Licensing Manager. To open TS Licensing Manager, click Start, point to Administrative Tools, point to Terminal Services, and then click TS Licensing Manager.
  2. If the User Account Control dialog box appears, confirm that the action it displays is what you want, and then click Continue.
  3. In the left pane, click All Servers.
  4. In the right pane, the Activation Status for the license server should be listed as Activated.
Reference LinksEvent ID 19 from Source Microsoft-Windows-TerminalServices-Licensing

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