Event ID 18456 - SQL Server 2014

This error occurs when the IIS site is reported as down, and the database cluster does not automatically failover the database. Running a network capture, but a main architectural issue is that the witness server for SQL Server 2014 resides on the mirror server, and Microsoft strongly recommends it being moved to a separate server.  Has anyone experienced this issue before?
jduran04Asked:
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Vitor MontalvãoMSSQL Senior EngineerCommented:
By Microsoft's article this error is due to a failed logon.
Are you trying to connect to the mirrored database instead the principal one?

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jduran04Author Commented:
The databases are coming up on both servers as mirrored.
Vitor MontalvãoMSSQL Senior EngineerCommented:
Weird. That only happens when the servers or one server and the witness loses their quorum.
jduran04Author Commented:
The more I research, the more it indicates an issue with the witness server, residing on either principal or the mirror server, which Microsoft strongly recommends be installed separately.
Vitor MontalvãoMSSQL Senior EngineerCommented:
Hi jduran,

Sorry to not coming here before but ran out of ideas. Did you manage to solve this issue?
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