Login failed for user ''(null)''. Reason: Not associated with a trusted SQL Server connectio
Whenever a timer job definition is edited by enabling or disabling it, following error gets recorded in the event log.
| EVENT LOG | Application |
| EVENT TYPE | Error |
| SOURCE | Windows SharePoint Services 3 |
| CATEGORY | Database |
| EVENT ID | 5586 |
| COMPUTERNAME | MOSS2007 |
| TIME | 8/21/2007 5:41:10 PM |
Unknown SQL Exception 18452 occured. Additional error information from SQL Server is included below. |
This also happens when I run 'stsadm -o sync' from the command line.
Because of the above errors, I don't think that some of the timer jobs are running successfully.
What makes this happen? Is there any cure for this?

