Problem with Listener.accept

[Student555]

There seems to be a problem with Listener.accept(socket). The program does not seem to execute past the conditional statement checking if the socket is accepted. For example, the program does not execute the

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system("Pause") command.

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int main()
{
 const unsigned ServerPort = 139;
 sf::TcpListener Listener;

 if(Listener.listen(ServerPort) != sf::Socket::Done)
  cout << "Error! an error occurred" << endl;
 else
  cout << "Success! Listening at " << ServerPort << endl;

 sf::TcpSocket socket;
 if(Listener.accept(socket) != sf::Socket::Done)       <-- Program just pauses
  cout << "Error! Could not set socket" << endl;

 system("Pause");     <-- Does not execute
 return 0;
}

What could cause this problem?

[jamesL]

http://www.sfml-dev.org/tutorials/2.4/network-socket.php

"The accept function blocks until a connection attempt arrives (unless the socket is configured as non-blocking)."

[Student555]

The above code is the server code on a different machine. In the server code I added the following line

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socket.setBlocking(true);
Below is the client code on my machine

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const unsigned ServerPort = 139;

sf::IpAddress ipAddress = sf::IpAddress::getLocalAddress();
sf::TcpSocket socket;
sf::Socket::Status status = socket.connect("192.168.1.251", ServerPort);

cout << ipAddress.getLocalAddress().toString() << endl;

if(status != sf::Socket::Done)
cout << "Error! Client did not connect to server!" << endl;
else
cout << "Success! Server " << socket.getRemoteAddress().toString() << endl;

Still not getting a response on the server code.

[eXpl0it3r]

Well does the client connect successfully?

Use Wireshark to see what your traffic is really doing.

[Student555]

It turns out all I needed to do was change my port number. Though, I'm curious as to what ports are best for networking for an application. I've heard that anything past 2000 is good. Is that true?

[Laurent]

Consider that anything < 1024 is reserved. Use high numbers to be safe (like 50000).