I have get massage (you have been disconnected)

after installing jitsi meet in ubuntu server VB … and testing it in browser from windows i have get massage (have been disconnected) … any help for this ?
and this is my browser console ;
2020-09-03T02:06:30.175Z [JitsiMeetJS.js] <Object.getGlobalOnErrorHandler>: UnhandledError: null Script: null Line: null Column: null StackTrace: Error: Strophe: request id 1.1 error 0 happened

strophe.umd.js:5123 POST https://1.39.5.249/http-bind?room=ew250 net::ERR_CONNECTION_RESET

What happens if you open: https://1.39.5.249/http-bind

i have reinstall jitsi step by step
i still get this error like that ;
2020-09-03T16:23:37.064Z [JitsiMeetJS.js] <Object.getGlobalOnErrorHandler>: UnhandledError: null Script: null Line: null Column: null StackTrace: Error: Strophe: request id 1.1 error 0 happened
at Object.r.Strophe.log (strophe.util.js:89)
at Object.error (strophe.umd.js:1392)
at P.Bosh._onRequestStateChange (strophe.umd.js:5017)
POST https://meet.elecwar.org/http-bind?room=ew250 net::ERR_NAME_NOT_RESOLVED
2020-09-03T16:26:52.010Z [modules/xmpp/strophe.util.js] <Object.r.Strophe.log>: Strophe: request id 2.2 error 0 happened

note : i am using jitsi for local network

Seems there is no dns for meet.ele…