Unable to clone an existing repo

Tried cloning an existing repo. Got this error message

fatal: unable to access 'https://skandpathak@bitbucket.org/metaiotdev/vehico-app.git/': Failed to connect to bitbucket.org port 443: Network is unreachable

I have attached the screenshot too. I have tried disabling the firewall,allowing incoming/outgoing on port 443(ufw) and setting the proxy settings to automatic,but same result. I have no idea what's wrong.