The server network address can not be reached or does not exist. (Microsoft SQL Server, Error: 1418)

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This post describes how to fix the error:
An error occurred while starting mirroring.
The server network address can not be reached or does not exist. (Microsoft SQL Server, Error: 1418)

The server network address can not be reached or does not exist. (Microsoft SQL Server, Error: 1418)

Cause

This error appears to be related to network connectivity however the cause in this case was that I had entered incorrect accounts in the Service Accounts step of the Configure Database Mirroring Security Wizard.

Configure database mirroring security wizard service accounts

I verified this by checking the SQL ERRORLOG (by default located here: C:\Program Files\Microsoft SQL Server\MSSQL15.MSSQLSERVER\MSSQL\Log).  This contained the following:

2020-07-03 10:39:31.76 Logon       Database Mirroring login attempt by user 'TEST2019\SQL2019-2K19-1$.' failed with error: 'Connection handshake failed. The login 'NT Service\MSSQL$MIRRORINSTANCE' does not have CONNECT permission on the endpoint. State 84.'.

Resolution

To resolve the issue, first delete the previously created endpoints on each SQL instance (the principal and the mirror):

DROP ENDPOINT Mirroring

Then create the endpoints again ensuring the correct service accounts are used:

Configure database mirroring security wizard correct service accounts

Note: If you try to start mirroring in the user interface:

Database properties start mirroring



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