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Tracing Network Calls

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Many common networking problems can be diagnosed by tracing System.Net events. This is often much easier than setting up packet captures or other software, particularly if you're working on a production machine. Since tracing is a part of the framework, it works almost everywhere just by dropping some additional configuration.

Here's an example of a complete configuration file for turning on System.Net tracing.

 <configuration>
 <system.diagnostics>
  <trace autoflush="true" />
  <sources>
   <source name="System.Net">
    <listeners>
     <add name="MyTrace"/>
    </listeners>
   </source>
  </sources>
  <sharedListeners>
   <add name="MyTrace" type="System.Diagnostics.TextWriterTraceListener" initializeData="trace.txt" />
  </sharedListeners>
  <switches>
   <add name="System.Net" value="Verbose" />
  </switches>
 </system.diagnostics>
</configuration>

You can also make the event source more specific by changing System.Net to one of System.Net.Sockets, System.Net.Cache, or System.Net.HttpListener.

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