When viewing the ESM Logs on the Archive Manager Server you see the following:
15:16:57 ERROR: dbo.MessageFolderInsert:
15:16:57 Error: Query timeout expired
15:16:57 Error 80040E31
Archive Items not processing.
Event log on Archive Manager Server displays the following Data Load Service Errors:
DataLoader: [1749612380-1179854255-15-0x0] Exception has been caught -
Exception Source: .Net SqlClient Data Provider
Exception Type: System.Data.SqlClient.SqlException
Exception Message: Timeout expired. The timeout period elapsed
prior to completion of the operation or the server is not responding.
Exception Target Site: OnError
Event Type: Error
Event Source: Data Load Service
Description: Configuration.SQL: [3067624754-3696774628-4-0x0]
Execute NonQuery: An error occurred running a SQL statement. Dumping the SqlCommand.
The Exception message was: [Timeout expired. The timeout period elapsed prior to completion of the operation or the server is not responding.]
SQL Lock or otherwise non responsive SQL server is the cause.
In some instances restarting the SQL server service is sufficient, however if this does not work, a reboot of the SQL server may be necessary.
Check all SQL jobs to see if any are causing process blocking.
See the following Microsoft article, "Minimize Blocking in SQL Server" for further information.