socket.io force a disconnect over XHR-polling

Question

I have a client/server application using nodejs on the server and socket.io as the connection mechanism. For reasons relevant to my application I want to have only one activ

Answer 1

You can also get "Error: xhr poll error" if you run out of open file descriptors available. This is likely to happen during a load test.

Check the current open file descriptor size:

ulimit -n

Increase it to a high number:

ulimit -n 1000000

Answer 2

Solved the issue, it turns out it was a bug introduced in socket.io 0.9.5. If you have this issue just update BOTH your server and client-side code to socket.io > 0.9.9 and set the socket.io client-side options sync disconnect on unload to true and you're all set.

Options are set this way:

var socket = io.connect('http://yourdomain.com', {'sync disconnect on unload' : true});