The Source and Log properties must be matched

When I try to start the service I get the following error:

Service cannot be started. System.ArgumentException: The source 'Bar source' is not registered in log 'Bar2'. (It is registered in log 'Bar source'.) " The Source and Log properties must be matched, or you may set Log to the empty string, and it will automatically be matched to the Source property. at System.Diagnostics.EventLogInternal.VerifyAndCreateSource(String sourceName, String currentMachineName) at System.Diagnostics.EventLogInternal.WriteEntry(String message, EventLogEntryType type, Int32 eventID, Int16 category, Byte[] rawData) at System.Diagnostics.EventLog.WriteEntry(String message) at Bar.Service1.writeToLog(String msg) in C:\Program Files (x86)\Bar - Used on APPS\Service1.vb:line 292 at Bar.Service1.OnStart(String[] args) in C:\Program Files (x86)\Bar - Used on APPS\Service1.vb:line 37 at System.ServiceProcess.ServiceBase.ServiceQueuedMainCallback(Object state)

Does anyone know what can cause the issue? I don't have any mention to Bar2 in the code, the folder in program files was called "Bar2" but I changed it to "Bar".

Please advise!

this is the WriteToLog function:

Private Sub writeToLog(ByVal msg As String)     Dim evtLog As New EventLog     If Not Diagnostics.EventLog.SourceExists("Bar") Then         Diagnostics.EventLog.CreateEventSource("Bar", "Log of Bar")     End If     evtLog.Source = "Bar"     evtLog.Log = "Log of Bar"     evtLog.WriteEntry(msg) End Sub 

2 Answers

Answers 1

The Log property stores the name of the event log, as visible in the Control Panel > Administrative Tools > Event Viewer applet. Most applications log to the Windows Logs > Application log, the default when you don't assign the Log property. But you can create a custom log for your own app, visible under the "Applications and Services Log" entry.

This info is recorded in the registry at the time you first create the log with CreateEventSource. The Log property must be a match in the future, if it is not then you get this exception. So what you know is that the log in fact already existed, but you once created it with a different log name, "Bar2". Possibly deciding that wasn't a very good name and changing the Log property. Kaboom.

Setting the Log property to an empty string is not a workaround. It will continue to log to the original log name, using the registry to find its name back. You can fix the unwanted registration with Regedit.exe, navigate to HKLM\SYSTEM\CurrentControlSet\Services\EventLog. If you delete the entry then you should also delete the corresponding .evtx file, the File value gives you its path name.

Answers 2

Leaving the log as an empty string solved the error:

Private Sub writeToLog(ByVal msg As String)     Dim evtLog As New EventLog     If Not Diagnostics.EventLog.SourceExists("Bar") Then         Diagnostics.EventLog.CreateEventSource("Bar", "")     End If     evtLog.Source = "Bar"     evtLog.Log = ""     evtLog.WriteEntry(msg) End Sub 

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