Sometimes, Socket.Accept will throw an Exception. It's only sometimes, and it's immediately after the program starts.

I do have a busy loop in to wait for an IP to be assigned, but otherwise I can't figure out what going on here. Ideas?

Chris:
The only way I can get Sockets to work is to catch the 10053 exception, sleep for 100ms and immediately try again. Sometimes it works on second or third try; sometimes more. I am not sure you are getting the same error code; can you post the debug?

Hoping to keep the discussion moving on the socket-related questions. I am new to the Netduino Plus with about 2 weeks under my belt of playing with it. A lot of my time is spent in .NET Visual Studio Emulator mode and moving to the hardware when I need to work on the hardware integration parts. I have noticed a few quirks with various differences between emulator and hardware deployed versions; this socket problem is one I am playing with and have not found a reliable workaround; yet. I reset all of my networking settings to static IP through MFDeploy.exe, and make my router aware of the NDP MAC address and reserved IP address; until I get a successful network ping on that static IP address. This sometimes takes a couple router resets to get right so Netduino responds to a ping. I am running a "tried-and-true" windows socket service on port 8484 on a completely different server. It is a basic service listening on port 8484 for a simple "HELLO" to come across the Tcp socket. The following snippet of a program works fine in emulator mode and I can connect 100% of the time. When I deploy to the hardware; no good. It sometimes connects, and generally stays connected; but when it fails to connect - forget it. It just keeps timing out. (this code is in a loop that keeps trying to connect until it does in the "real" software) I am including code and the associated debug output. Any insight on what I can try next would be helpful. Oh, I flashed to 4.1.1 from 4.1.0.6 and fixed my SD card issues; but seemed to make this issue worse (but I may have just been tired and hopped up on Coke Zero...) I have not tried 4.2 yet. -->(snip)<-- public class Program { public static void Main() { int port = 8484; string server = "192.168.5.102"; ShowNetworks(); try { Debug.Print("Defininig new socket "); Socket serverSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp); Debug.Print("Defininig new static endpoint and connecting to "+ server + "on port " + port.ToString()); IPHostEntry hostEntry = Dns.GetHostEntry(server); serverSocket.Connect(new IPEndPoint(hostEntry.AddressList[0], port)); Debug.Print("Sending a HELLO statemnt to the waiting service"); Byte[] bytesToSend = Encoding.UTF8.GetBytes("HELLO\n" + "12345678910\n"); serverSocket.Send(bytesToSend, bytesToSend.Length, 0); } catch (SocketException se) { Debug.Print("SocketException when connecting to " + server + "."); Debug.Print("Socket Error Code: " + se.ErrorCode.ToString()); Debug.Print(se.ToString()); } } private static void ShowNetworks() { NetworkInterface[] adapters = NetworkInterface.GetAllNetworkInterfaces(); foreach (NetworkInterface adapter in adapters) { int i = 0; foreach (string s in adapter.DnsAddresses) { i++; Debug.Print("DNS Address : " + s); } if (i == 0) Debug.Print("No DNS Address"); Debug.Print("Default Gateway: " + adapter.GatewayAddress); Debug.Print("IP Address : " + adapter.IPAddress); Debug.Print("Is DHCP Enabled: " + adapter.IsDhcpEnabled); Debug.Print("Is Dynamic DNS : " + adapter.IsDynamicDnsEnabled); Debug.Print("Interface Type : " + adapter.NetworkInterfaceType.ToString()); Debug.Print("MAC Address : " + ToHexString(adapter.PhysicalAddress)); Debug.Print("SubnetMask : " + adapter.SubnetMask + "\n"); } } } -->(Debug Output)<-- No DNS Address Default Gateway: 192.168.5.1 IP Address : 192.168.5.50 Is DHCP Enabled: False Is Dynamic DNS : False Interface Type : 6 MAC Address : 5C-86-4A-00-4F-1D SubnetMask : 255.255.255.0 Defininig new socket Defininig new static endpoint and connecting to 192.168.5.102on port 8484 #### Exception System.Net.Sockets.SocketException - CLR_E_FAIL (1) #### #### Message: #### Microsoft.SPOT.Net.SocketNative::connect [IP: 0000] #### #### System.Net.Sockets.Socket::Connect [IP: 001d] #### #### NetduinoPlusApplication1.Program::Main [IP: 0044] #### #### SocketException ErrorCode = 10053 #### SocketException ErrorCode = 10053 A first chance exception of type 'System.Net.Sockets.SocketException' occurred in Microsoft.SPOT.Net.dll #### SocketException ErrorCode = 10053 #### SocketException ErrorCode = 10053 SocketException when connecting to 192.168.5.102. Socket Error Code: 10053 System.Net.Sockets.SocketException The thread '<No Name>' (0x1) has exited with code 0 (0x0). Done. Waiting for debug commands... The program '[3] Micro Framework application: Managed' has exited with code 0 (0x0).