How do I debug error ECONNRESET in Node.js?

Question

I\'m running an Express.js application using Socket.io for a chat webapp and I get the following error randomly around 5 times during 24h. The node process is wrapped in for

Answer 1

I also get ECONNRESET error during my development, the way I solve it is by not using nodemon to start my server, just use "node server.js" to start my server fixed my problem.

It's weird, but it worked for me, now I never see the ECONNRESET error again.

Answer 2

Yes, your serving of the policy file can definitely cause the crash.

To repeat, just add a delay to your code:

net.createServer( function(socket) 
{
    for (i=0; i<1000000000; i++) ;
    socket.write("<?xml version=\"1.0\"?>\n");
…

… and use telnet to connect to the port. If you disconnect telnet before the delay has expired, you'll get a crash (uncaught exception) when socket.write throws an error.

To avoid the crash here, just add an error handler before reading/writing the socket:

net.createServer(function(socket)
{
    for(i=0; i<1000000000; i++);
    socket.on('error', function(error) { console.error("error", error); });
    socket.write("<?xml version=\"1.0\"?>\n");
}

When you try the above disconnect, you'll just get a log message instead of a crash.

And when you're done, remember to remove the delay.