Getting you have been disconnected continuously without reconnecting again

I am getting a screen with progress bar saying that you have been disconnected adding the console log for the same.

[JitsiMeetJS.js] : UnhandledError: null Script: null Line: null Column: null StackTrace: Error: Strophe: BOSH-Connection failed: host-unknown
log strophe.util.js:89
error strophe.umd.js:1392
_connect_cb strophe.umd.js:4697
_connect_cb strophe.umd.js:3229
_onRequestStateChange strophe.umd.js:5012
[modules/xmpp/strophe.util.js] <t.a/r.Strophe.log>: Strophe: BOSH-Connection failed: host-unknown

getting unknow host from xmpp server i cross checked the host name could not found anything mismatched.
adding image of the screen.