Substring/RemoteForwarder Error on Cloud Service Classic

Using Azure Cloud Service Classic with WorkerRoles and ran into this error. I'm not sure what exactly is going on.

Message="System.ArgumentOutOfRangeException: Length cannot be less than zero.
Parameter name: length

Server stack trace: 
   at System.String.Substring(Int32 startIndex, Int32 length)
   at Microsoft.WindowsAzure.Plugins.RemoteForwarder.RdpRemoteEndpointFinder.GetRemoteEndpoint(Socket clientSocket, Stream peekBuffer)

Exception rethrown at [0]: 
   at System.Runtime.Remoting.Proxies.RealProxy.HandleReturnMessage(IMessage reqMsg, IMessage retMsg)
   at System.Runtime.Remoting.Proxies.RealProxy.PrivateInvoke(MessageData& msgData, Int32 type)
   at Microsoft.WindowsAzure.Plugins.RemoteForwarder.IRemoteEndpointFinder.GetRemoteEndpoint(Socket clientSocket, Stream peekBuffer)
   at Microsoft.WindowsAzure.Plugins.RemoteForwarder.RemoteForwardingService.ClientConnected(Object sender, ConnectionEventArgs e)
   at Microsoft.WindowsAzure.Plugins.RemoteForwarder.TcpSocketServer.OnClientConnected(ConnectionEventArgs e)"