[RESOLVED] Socket Receive

[mickey_pt]

Hi everyone

I have a little problem with a socket that i'm using to get the current date and time for an serve, i can send the request, but i don't receive anything.

The current code:

Dim sock As New Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp)
        Dim ip As Net.IPHostEntry = Net.Dns.GetHostEntry("time-a.nist.gov")
        Dim iep As New Net.IPEndPoint(ip.AddressList(0), 123)
 
        sock.Connect(iep)
        If sock.IsBound Then Debug.WriteLine("Connected...")
 
        sock.SendTimeout = 3000
        sock.ReceiveTimeout = 15000
        Dim bytesSent As Integer = sock.Send(SNTPData)
        Dim bytesRec As Integer = sock.Receive(SNTPData)

The SNTPData has the correct size and the correct format.

The timeout and the error:

A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond

What i'm missing here?

THanks

[mickey_pt]

Solved
Use another version of the Receive method.

Dim bytesRec As Integer = sock.ReceiveFrom(SNTPData, iep)

[Shaggy Hiker]

So, you get as far as send, but then the error occurs? Does it take you to the Send line such that the Receive line is never reached?

Frankly, I don't think the Receive line is all that good. If Send doesn't block, the Receive line will be executed pretty much immediately, before even a fast reply could arrive well. The socket should raise an event that you can handle, though to be fair, I have only worked with UDP lately, which isn't quite the same. In any case, the error doesn't sound consistent with this issue anyways. You are getting a timeout, which I would not expect to happen with the Receive call.

[Niya]

He could have simply set ReceiveTimeOut to 0 which would block until the socket actually received data. His code is throwing that exception because that's that the time out is supposed to do.