I have a development server with 3 instances: Default, A and B. It is a physical server, non clustered. Whenever the syspolicy_purge_history job runs at 2 am, I get failed login alerts. Looking at the job steps, all are successfully completed. It appears that some point during the step "Erase Phantom System Health Records" is when the failed logins occur. syspolicy_purge_history on instance B works OK. syspolicy_purge_history on the Default instance seems to want to connect to instance B, resulting in: Error: 18456, Severity: 14, State: 11. Login failed for user 'Machinename\sqlsvc-B'. Reason: Token-based server access validation failed with an infrastructure error. Check for previous errors. [CLIENT: <local machine>] . No errors are reported by Powershell. syspolicy_purge_history on the A instance seems to want to connect to the Default instance resulting in Error: 18456, Severity: 14, State: 11. Login failed for user 'Machinename\sqlsvc-Default'. Reason: Token-based server access validation failed with an infrastructure error. Check for previous errors. [CLIENT: <local machine>] . Then it tries to connect to the B instance, resulting in Error: 18456, Severity: 14, State: 11. Login failed for user 'Machinename\sqlsvc-B'. Reason: Token-based server access validation failed with an infrastructure error. Check for previous errors. [CLIENT: <local machine>] . No errors are reported by Powershell. I tried the steps posted here hoping they would fix it. http://support.microsoft.com/kb/955726 But again, this is not a virtual server nor is it in a cluster. Do you have any suggestions? Thanks.