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Editorial Team
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Asked: 2026-05-26T22:35:11+00:00

Exception during writing event log on host machine(Windows 2008 R2) hosting WCF Service named

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Exception during writing event log on host machine(Windows 2008 R2) hosting WCF Service named my machine
from WCFClient (Windows 7) running within domain but on a different machine.

WCF Client is impersonated to access resources on Server.

So far following links have not helped

http://support.microsoft.com/kb/2028427#appliesto

http://forums.asp.net/t/1131903.aspx

http://msdn.microsoft.com/en-us/library/Aa379567 (Detals about SDDL)
http://blogs.dirteam.com/blogs/jorge/archive/2008/03/26/parsing-sddl-strings.aspx (SDDL)

similar question on SO without any answer
https://stackoverflow.com/questions/6456444/allow-wcf-services-writing-to-custom-event-log-under-windows-2008-r2-server

Exception is as follows

System.ServiceModel.FaultException`1[System.ServiceModel.ExceptionDetail]: Cannot open log for source ‘MyService’. You may not have write access. (Fault Detail is equal to An ExceptionDetail, likely created by IncludeExceptionDetailInFaults=true, whose value is:
System.InvalidOperationException: Cannot open log for source ‘MyService’. You may not have write access. —-> System.ComponentModel.Win32Exception: Access is denied

— End of inner ExceptionDetail stack trace —
at System.Diagnostics.EventLogInternal.OpenForWrite(String currentMachineName)
at System.Diagnostics.EventLogInternal.InternalWriteEvent(UInt32 eventID, UInt16 category, EventLogEntryType type, String[] strings, Byte[] rawData, String currentMachineName)
at System.Diagnostics.EventLogInternal.WriteEntry(String message, EventLogEntryType type, Int32 eventID, Int16 category, Byte[] rawData)
at System.Diagnostics.EventLog.WriteEntry(String message, EventLogEntryType type)
……………….
…………………

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1 Answer

  1. Editorial Team

    Modified ProcesModel’s Identity of AppPool from NetworkService to LocalSystem and everything is working.

    Although this is not public facing site and is a corporate distributed setup which will run within its own domain but one can still argue about security risk.

    and possible solution can be

    To separate the Event writing code from Imperosnation

    or just elevate permission for offending code.

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