Socket.io error

Hi,

I have a digital ocean server and have installed all the packages required to broadcasting in laravel 5.2 I have only one problem, I see in the terminal that the queue is sending the broadcast but in my view I have an error:

socket.io-1.4.5.js:1 GET http://mydomain.com:3000/socket.io/?EIO=3&transport=polling&t=LFOZDRo net::ERR_CONNECTION_REFUSED

Every second I get this error in the console...

I have disabled the firewall so all the ports are open..

Can someone help me out?