Can't connect to Github's website in Chrome but it works when I use Firefox

It is possible that you might have deleted trusted certificates from chrome trust store (github CA SSL certificate is issued by DigiCert High Assurance EV Root CA ), where as in for other browsers the trust store must be a different location in your case.

To check above listed certificate present in Chrome trusted store or not, do the following

Open Chrome then Go to Settings => Manage Certificates - Click on it, when Certificates pop-up shows then check at' Trusted Root Certificates Authorities, if desired certificate is not present then import it.

For what it's worth, this is what worked for me:

1. Open up the start menu and search for and open "Internet Options".
2. Go to the "Connections" tab.
3. Click on "LAN settings".
4. Untick all the checkboxes (there are 3).
5. Click OK twice and then access https://github.com/ via Google Chrome.

The reason why it works on Firefox is because it has its own proxy settings. Google Chrome takes the proxy settings of the computer.

If you enter the website URL with www, it will work in chrome.To avoid this you need to add another CNAME without www.