Node.js "Server listening on port 3000", but I can't view it in browser? -

i trying simple node app running. works fine on localhost, trying run on cloud server, doesn't work. when "node app.js" in right path console.log express server started on port %s', server.address().port , says port 3000(express server started on port 3000). when change server.listen port, displays right port.

now when try running via domain or via ip(for example xx.xxx.xx.xx:3000) or domain (my-domain.com:3000) in both cases doesn't work. think don't quite concept , tried search billion different things, can't find solution problem. tell me, if need setup else, too?

propably cloud hosting provider doesn't have port open access. try port 80 open.