Failed to connect to bitbucket.org port 443

Hi,

I am trying to take push the code on bitbucket repo and getting the following error
i am using ubuntu os.
fatal: unable to access 'https://anuraggupta816@bitbucket.org/anuraggupta816/codeigniter_php.git/': Failed to connect to bitbucket.org port 443: Network is unreachable
any help will be appreciated.