I am currently running a multi-portal web environment in DNN 5.6.1. I get a lot (50 - 100 a day) of the following messages in my event viewer and cannot figure out what is causing them (I am not a programmer, but have been using DNN for a long time). I also received these messages in earlier versions of DNN. My sites do not seem to be suffering from any performance issues otherwise, and I have limited the size of the event log. Please help me remedy this if you can. Here is the log entry:

1/25/2011 7:29:55 PM   General Exception       AssemblyVersion: 5.6.1; PortalID: -1; PortalName ...

AssemblyVersion: 5.6.1 PortalID: -1 PortalName: UserID: -1 UserName: ActiveTabID: -1 ActiveTabName: RawURL: AbsoluteURL: AbsoluteURLReferrer: UserAgent: DefaultDataProvider: DotNetNuke.Data.SqlDataProvider, DotNetNuke.SqlDataProvider ExceptionGUID: 58308976-d135-42f4-bab7-f04c0c49a36c InnerException: This operation returned because the timeout period expired. (Exception from HRESULT: 0x800705B4) FileName: FileLineNumber: 0 FileColumnNumber: 0 Method: System.Threading.ReaderWriterLock.AcquireReaderLockInternal StackTrace: Message: System.ApplicationException: This operation returned because the timeout period expired. (Exception from HRESULT: 0x800705B4) at System.Threading.ReaderWriterLock.AcquireReaderLockInternal(Int32 millisecondsTimeout) at DotNetNuke.Services.Scheduling.DNNScheduling.Scheduler.CoreScheduler.get_ScheduleInProgress() Source: Server Name: WEBA17

That thread offered multiple recommendations all in different directions, including moving my web files and database to a different server. Kinda drastic without knowing if that is really the problem. Sounds like we are just guessing here.