Hi,
did this happen near the end of the process lifetime (i.e. when you closed the application that uses log4net for logging)? Cheers, D. _____ From: Dmitry Pogodin [mailto:lunatic...@gmail.com] Sent: Wednesday, January 09, 2013 11:38 AM To: log4net-user@logging.apache.org Subject: log4net:ERROR Failed to append to appender [EventLogAppender] Good time of day to you! I've got the following exception while using log4net: log4net:ERROR Failed to append to appender [EventLogAppender] System.Threading.ThreadAbortException: Thread was being aborted. at System.Threading.Monitor.Enter(Object obj) at log4net.Appender.AppenderSkeleton.DoAppend(LoggingEvent loggingEvent) at log4net.Util.AppenderAttachedImpl.AppendLoopOnAppenders(LoggingEvent loggi ngEvent) log4net:ERROR Exception while logging System.Threading.ThreadAbortException: Thread was being aborted. at log4net.Util.AppenderAttachedImpl.AppendLoopOnAppenders(LoggingEvent loggi ngEvent) at log4net.Repository.Hierarchy.Logger.CallAppenders(LoggingEvent loggingEven t) at log4net.Repository.Hierarchy.Logger.ForcedLog(Type callerStackBoundaryDecl aringType, Level level, Object message, Exception exception) at log4net.Repository.Hierarchy.Logger.Log(Type callerStackBoundaryDeclaringT ype, Level level, Object message, Exception exception) I use the following config: <log4net> <root> <level value="ALL"/> <appender-ref ref="EventLogAppender"/> </root> <appender name="EventLogAppender" type="log4net.Appender.EventLogAppender" > <logName value="TestLog"> <applicationName value="SampleApp" /> </logName> <layout type="log4net.Layout.PatternLayout"> <conversionPattern value="%date %logger - %message%newline" /> </layout> </appender> </log4net> Ready to give more information if you need. Best regards, lunaticare