Video chat not display ???

Hi!
Special Thank to your project, but I have a problem when using that project on my Web server (Run Ubuntu 14, have HTTPS ) 
No problem if using project with 2,3,4.... device if them in only 1 IP adress (on LAN)
but if using with different IP, project will display block for remotes client in web browse , but not display video chat to view !
Can you tell me how to fix it!