Our two server SharePoint 2007 SP2 farm has an issue. Event ID 6482 appears in the Application log of the Web front end many times a day. Often many time a minute.

The full error is from Office SharePoint Server

Event Type: Error
Event Source:   Office SharePoint Server
Event Category: Office Server Shared Services 
Event ID:   6482
Date:       11/12/2009
Time:       3:05:22 PM
User:       N/A
Computer:   XXXXXX
Description:
Application Server Administration job failed for service instance Microsoft.Office.Server.Search.Administration.SearchServiceInstance (36a9b7ef-59aa-4f94-8887-8bf7b56f2f91).

Reason: Error during encryption or decryption. System error code 0.

Techinal Support Details:
System.ArgumentException: Error during encryption or decryption. System error code 0.
   at Microsoft.Office.Server.Search.Administration.SearchServiceInstance.SynchronizeDefaultContentSource(IDictionary applications)
   at Microsoft.Office.Server.Search.Administration.SearchServiceInstance.Synchronize()
   at Microsoft.Office.Server.Administration.ApplicationServerJob.ProvisionLocalSharedServiceInstances(Boolean isAdministrationServiceJob)

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

The SharePoint site appears to be functioning normally and Search returns expected results.

Any suggestions would be appreciated