title: Cannot catch stacktrace of Current domain_UnhandledException System.UriFormatException
body: <p>My app crashes in some periods on one device with following error by  Invalid URI: Invalid port specified.</p>
  
  <p>The problem is that i cannot find specific method causes this. And its crashes only on 1 device in some German Network Area. Stack Trace is showing only following message :</p>
  
  <pre><code>Current domain_UnhandledException. Stack trace: System.UriFormatException: Invalid URI: Invalid port specified.
     at System.Uri.CreateThis(String uri, Boolean dontEscape, UriKind uriKind)
     at System.Uri..ctor(String uriString)
     at HttpServer.HttpClientContext.OnRequestLine(Object sender, RequestLineEventArgs e)
     at System.EventHandler`1.Invoke(Object sender, TEventArgs e)
     at HttpServer.Parser.HttpRequestParser.OnFirstLine(String value)
     at HttpServer.Parser.HttpRequestParser.Parse(Byte[] buffer, Int32 offset, Int32 count)
     at HttpServer.HttpClientContext.OnReceive(IAsyncResult ar)
     at System.Net.LazyAsyncResult.Complete(IntPtr userToken)
     at System.Net.ContextAwareResult.CompleteCallback(Object state)
     at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
     at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
     at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
     at System.Net.ContextAwareResult.Complete(IntPtr userToken)
     at System.Net.LazyAsyncResult.ProtectedInvokeCallback(Object result, IntPtr userToken)
     at System.Net.Sockets.BaseOverlappedAsyncResult.CompletionPortCallback(UInt32 errorCode, UInt32 numBytes, NativeOverlapped* nativeOverlapped)
     at System.Threading._IOCompletionCallback.PerformIOCompletionCallback(UInt32 errorCode, UInt32 numBytes, NativeOverlapped* pOVERLAP)
  </code></pre>
  
  <p>Can i get some ideas , how can i find the crash source ?</p>