Tracing on the server side - MrAntix/SignalR GitHub Wiki

  <system.diagnostics>
    <trace autoflush="true" indentsize="4">
      <listeners>
        <add name="default_traces" type="System.Diagnostics.TextWriterTraceListener" initializeData="default_traces.txt" />
      </listeners>
    </trace>
    <switches>
      <add name="SignalRSwitch" value="All" />
    </switches>
    <sources>

      <source name="Application" switchValue="All">
        <listeners>
          <add name="traces" />
        </listeners>
      </source>

      <source name="Microsoft.Owin.Host.SystemWeb" switchValue="All">
        <listeners>
          <add name="traces" />
        </listeners>
      </source>

      <source name="SignalR.Connection">
        <listeners>
          <add name="traces" />
        </listeners>        
      </source>
      <source name="SignalR.PersistentConnection">
        <listeners>
          <add name="traces" />
        </listeners>
      </source>
      <source name="SignalR.HubDispatcher">
        <listeners>
          <add name="traces" />
        </listeners>
      </source>
      <source name="SignalR.Transports.WebSocketTransport">
        <listeners>
          <add name="traces" />
        </listeners>
      </source>
      <source name="SignalR.Transports.ServerSentEventsTransport">
        <listeners>
          <add name="traces" />
        </listeners>
      </source>
      <source name="SignalR.Transports.ForeverFrameTransport">
        <listeners>
          <add name="traces" />
        </listeners>
      </source>
      <source name="SignalR.Transports.LongPollingTransport">
        <listeners>
          <add name="traces" />
        </listeners>
      </source>
    </sources>
    <sharedListeners>
      <add name="traces" type="System.Diagnostics.TextWriterTraceListener" initializeData="server_traces.txt" />
    </sharedListeners>
  </system.diagnostics>