cant communicate with other computer using socket.io node.js

I'm trying to play with node.js using socket.io

anyway, when using on my local network I get an error:

got heartbeat packet
   debug - cleared heartbeat timeout for client 4BMneKTWn1Qph1iMNbJf
   debug - set heartbeat interval for client 4BMneKTWn1Qph1iMNbJf
   debug - emitting heartbeat for client MqmuDptZ35RVawHKNbJl
   debug - websocket writing 2::
   debug - set heartbeat timeout for client MqmuDptZ35RVawHKNbJl

When Im using my local machine I can open multiple windows and it works.

I change the index.html to the right path and I can see the server log so that's good.

basically the issue is the computer that connect to my server/computer cant transmit his changes.

Thanks for all of you guys!