I recently had to modify the Endpoint URLs on our SQL Server Availability Group replicas. The reason for this blog post is that I could not answer the following questions: Do I need to suspend data movement prior to making this change? Would this change require a restart of the database instance? I spent enough time searching on my own to no avail that I tossed the question to the #sqlhelp hashtag on Twitter and Slack but didn't get an answer prior to executing the change request. After reading the relevant documentation, I think it's probably a good idea to suspend data movement for this change. The T-SQL is straightforward. USE MASTER GO ALTER AVAILABILITY GROUP [AG1] MODIFY REPLICA ON 'SQL2012-1' WITH (ENDPOINT_URL = 'TCP://10.10.10.1:5022'); ALTER AVAILABILITY GROUP [AG1] MODIFY REPLICA ON 'SQL2012-2' WITH (ENDPOINT_URL = 'TCP://10.10.10.2:5022'); ALTER AVAILABILITY GROUP [AG2] MODIFY REPLICA ON 'SQL2012-1