Cannot connect to Thingsboard demo server

I was connected and capable of tranfering data few days ago.Without changing anything in my code, i am unable to connect now.I am coding in arduino IDE.

The demo server and TOKEN is being given correctly, although the tb.connect(host,token) returns false.
The only thing that changed those days, is that i was transfered in a new location with a different netwotk.Is there any issues with security policies etc and if yes, how can i overcome this?