constant "check your firewall"

Hi! I have the next issue:

Creative cloud is not opening, constanyly saying check your firewall or internet connection.

MacOS system, fully updated, already deleted creative cloud and after effects and tried to install again - same issue when trying to open creative cloud. Internet is not a top notch but still working, yesterday everything was fine. 

Restarted system - same issue. Firewall is down, so the problem is definitely not there.

What should I do?