"fatal: HttpRequestException encountered." Error with GitHub/Bitbucket Repositories due to dropping TLS-1.0 support
Git hub has removed TLS-1.0 from it's authentication services. https://githubengineering.com/crypto-removal-notice/
Solutions
Windows Clients
Use Version 2.14.3 (or newer) of Git for Windows and newer include an up-to-date Git Credential Manager for Windows: https://gitforwindows.org/
You can also explicitly update your Git Windows Credencial Manager to the latest version, 1.14.0, to get TLS-1.2 support: https://github.com/Microsoft/Git-Credential-Manager-for-Windows/releases/tag/v1.14.0
Visual Studio Clients
It is suggested to update your client to VS 2017 or, if you cannot upgrade, there are two machine-wide registry keys you can set that affect all .NET-based applications on the client machine that you can change... https://developercommunity.visualstudio.com/content/problem/201457/unable-to-connect-to-github-due-to-tls-12-only-cha.html
JDK
TLS-1.2 is default in JDK8 and available in JDK7. https://blogs.oracle.com/java-platform-group/diagnosing-tls,-ssl,-and-https
Red Hat native Git clients
RH 5 does not support TLS-1.2 and GitHubEngineering suggest updating to newer versions of the OS. RH 6.8 and 7.2 will support TLS-1.2. https://www.linuxquestions.org/questions/blog/mensawater-183304/rhel5-wont-support-tlsv1-1-or-higher-36951/
Step 1 Firstly you need to download and install the latest version of the Git Windows Credential Manager.
Here is the link to it on GitHub. https://github.com/Microsoft/Git-Credential-Manager-for-Windows/releases/latest
Step 2 Restart your machine.
Step 3 Enter a git command in the command line and you will be prompted to login again.
Step 4 If you still get the same fatal error, you will need to update Git by downloading the latest version from here: https://git-scm.com/downloads
Step 5 Enter a git command in the command line and you will be prompted to login again. The problem should be solved now and you should be able to carry on working as normally.
TLS support is discontinued in older versions of git.
Upgrading git on your machine solves this problem.
Download the latest git and install for your machine from here: https://git-scm.com/downloads.