How to Add the CMS Instance to the Central Management Server
If you have used the Central Management Server (CMS) feature in SQL Server 2008+, by now you know that you can’t add the SQL Server instance that you are using to host the CMS as a registered server to the CMS. That is, you can’t directly add it. There is, however, a workaround as long as you connect to your servers via TCP/IP. To work around this limitation in the CMS functionality:
Right click on the CMS and click “New Server Registration”
In the “Server name:” text box type in the IP address of the server, a comma and the port number that the instance is listening on. In this example, the test server’s IP address is 192.168.1.1 and the instance that I want to add, which also houses the CMS, is listening on port 1433.
In the “Registered server name:” text box, type the name of the instance (in this case, Test) and voilà, we have now been able to register the CMS instance on the CMS.