I faced this issue via trying to push my local repository to my GitHub account.
Then I got this error message.
fatal: unable to access 'https://github.com/username/example.git/': Failed to connect to github.com port 443 after 21151 ms: Couldn't connect to server
I tried it several times.
Juan_m_2
On
You are probably having connectivity issues with https://github.com/ are you able to open it in your web browser?
This can be happened due to your proxy settings. I changed my network to my mobile network from our university Wi-Fi network. Then it worked! In here the issue was some files couldn't be uploaded via our university Wi-Fi network due to their proxy settings.