Logon Failure - Authz EventID 537

Hello Experts,

I have a database setup with a mirror on a different database server.

When I setup the mirror I recieve logon failure audits as noted below every minute on both the principal and mirror database servers.

The logon failures are associated with the account running the SQL Server service. They are local accounts.

The mirror functions properly but the logged events are annoying.

I have narrowed this issue down to occuring only when I setup a mirror.

How can I prevent these failure audits and continue to use the local user account that runs the SQL service?

Event Type: Failure Audit
Event Source: Security
Event Category: Logon/Logoff
Event ID: 537
Date: 2/22/2008
Time: 11:39:00 AM
User: NT AUTHORITYSYSTEM
Computer: <servername>
Description:
Logon Failure:
Reason: An error occurred during logon
User Name:
Domain:
Logon Type: 3
Logon Process: Authz
Authentication Package: Kerberos
Workstation Name: ISIDEVAPP08
Status code: 0xC000005E
Substatus code: 0x0
Caller User Name: SQLService
Caller Domain: <servername>
Caller Logon ID: (0x0,0x6361C9)
Caller Process ID: 5084
Transited Services: -
Source Network Address: -
Source Port: -

For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.