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copied!<p>In my experience, log4net usually swallows any internal errors, simply resulting in log statements that do not produce any results.</p> <p>What you may want to try is enable log4net's internal logging. You can do this by adding the following to your <code>appSettings</code> section:</p> <pre><code><add key="log4net.Internal.Debug" value="true" /> </code></pre> <p>This sets the property <a href="http://logging.apache.org/log4net/release/sdk/log4net.Util.LogLog.InternalDebugging.html" rel="noreferrer"><code>LogLog.InternalDebugging</code></a> to <code>true</code>. log4net will now log to the standard output and error streams and to configured trace listeners.</p> <p>You can use the <a href="http://msdn.microsoft.com/en-us/library/system.diagnostics.textwritertracelistener.aspx" rel="noreferrer">following configuration</a> to capture any messages logged to tracing:</p> <pre><code><system.diagnostics> <trace autoflush="false" indentsize="4"> <listeners> <add name="myListener" type="System.Diagnostics.TextWriterTraceListener" initializeData="c:\TextWriterOutput.log" /> <remove name="Default" /> </listeners> </trace> </system.diagnostics> </code></pre> <p>All messages logged by log4net internally will appear in <code>TextWriterOutput.log</code>. If you get a <code>SecurityException</code> when you add the trace listener to your configuration, then very probably the apppool identity does not have sufficient rights to create a file at the specified location (in the example: <code>c:\</code>). Try another location or give the apppool identity sufficient rights.</p>

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