altera simple socket server troubles

There is a number of reasons which can cause your application to stop.

First of all you must know if the whole application crashes or it's a matter of a single task;

use a separate tasks to toggle a signal or blink a LED in order to understand this.

Also try to keep the send queue limited. I mean, before sending more data, wait until you received a certain amount. For example, if you were transmitting 1,2,3, etc. , don't send N until you have received N - K, where K is the queue limit you choose.

If this way the system works, then you have a problem with your task stack size or with memory available for managing network packets.