I'm setting up a Mirroring study session in separated servers.

Everything looks ok, the firewall in my machine is disabled and in the another server it has an inbound\outbound rule to accept port 5022.

I could check that both endpoints are created and STARTED in both servers with SELECT * FROM sys.database_mirroring_endpoints.

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I tried with both configurations, by using services account, and leaving them blank.

I checked with port query that the server is listening on this ports:

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What more can I check?

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The reason I'm asking this question is because I read every other question about mirroring here, but none of them could help me.

In a post, I read that someone fixed the error with:

Go to services.msc and check the sql server is running under which account. Make sure that sql server and sql server agent services should run with same credentials.

But I use different credentials for AGENT and SQL SERVER.

Is this a problem? I've never seen this before.


I could fix this error ( it still shows me this error, but if I run the mirror again, it shows me error 1431.)

Using ALTER DATABASE [Database_Name] SET PARTNER OFF didn't solve the problem. it just restart the task, and errors and errors again.

  • Are they both the same edition of SQL? Mar 28, 2017 at 14:08
  • Yes, both SQL Server 2014.
    – Racer SQL
    Mar 28, 2017 at 14:14
  • That's version. What edition(s)? Such as Developer, Enterprise, or Standard. Mar 28, 2017 at 14:15
  • Oh Sorry, both enterprise edition.
    – Racer SQL
    Mar 28, 2017 at 14:16
  • Are both instances of sql server running under the same service account? If not you'll need to use a certificate and proxy accounts. Mar 28, 2017 at 14:35

1 Answer 1


Have you granted the CONNECT permission to the Mirroring Endpoint for the SQL Server service account?

GRANT CONNECT on ENDPOINT::Mirroring_Endpoint TO [domain\user];

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