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Reason: GitHub disabled tls1.0/1.1 protocol

As of February 22, 2018, GitHub has disabled support for weak encryption, which means that many users will suddenly find themselves unable to use git for windows for authentication (impact version is lower than v2.16.0). Don’t panic, there’s a fix. Update git for windows to the latest version (or at least v2.16.0)

The most common errors users see are as follows:

fatal: HttpRequestException encountered.
   An error occurred while sending the request.
fatal: HttpRequestException encountered.
   An error occurred while sending the request.
Username for 'https://github.com':

Git certificate manager (GCM) of windows provides secure git certificate storage for windows

To use GCM, you can download the latest installation program. To install, double-click setup.exe and follow the instructions provided

When prompted to select git bash’s terminal emulator, you should select the default console window of windows, or make sure GCM is configured to use modal dialog. In mintty settings, GCM cannot prompt you for credentials in the console

Link address: https://github.com/Microsoft/Git-Credential-Manager-for-Windows/releases/tag/v1.14.0 I use the version 1.140. I can choose the latest version for personal use