App.config

<configuration>

  <system.diagnostics>
    <sources>
      <source name="System.Net.Sockets" tracemode="protocolonly">
        <listeners>
          <add name="System.Net.Sockets" type="System.Diagnostics.TextWriterTraceListener" initializeData="network.log" />
        </listeners>
      </source>
    </sources>

    <switches>
      <add name="System.Net.Sockets" value="Verbose"/>
    </switches>

    <trace autoflush="true" />
  </system.diagnostics>
</configuration>