log4net: write to event log on server - iis

Question

My application uses:
.NET 4
MVC 3
Windows Server 2008 R2
I use log4net to write to a logs on event log.
My configuration file looks like this:
<configuration>
<log4net>
<appender name="EventLogAppender" type="log4net.Appender.EventLogAppender">
<param name="LogName" value="SomeLogName"/>
<param name="ApplicationName" value="MyAppName"/>
<some settings for log4net...>
</appender>
<log4net>
</configuration>
It works well when I run it on my computer (localhost).
But I can not write to event log on server.

Answer 1

You should check if the apppool user has full control over the logging directory. He has to have create and update rights.
Enable internal debugging:
<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<appSettings>
<add key="log4net.Internal.Debug" value="true"/>
</appSettings>
</configuration>
Or:
<configuration>
...
<system.diagnostics>
<trace autoflush="true">
<listeners>
<add
name="textWriterTraceListener"
type="System.Diagnostics.TextWriterTraceListener"
initializeData="C:\tmp\log4net.txt" />
</listeners>
</trace>
</system.diagnostics>
...
</configuration>
The C:\tmp\ dir has to excits and you should give the apppool user full control on the directory.