Could not connect to the server sockjs

Hi,
i have this meteor app deployed on iPad
when my meteor app is starting i have this error

Failed to load resource: Could not connect to the server sockjs

this error doesn’t occur when i am debugging the same application on my browser

it is quite wired because i never had it before and plus i am not connecting to any meteor server but just connecting to a regular websocket (later).

and i use
Meteor.startup(function() {
Meteor.disconnect();
}

what should i change?