Github desktop could not reach server

Describes the cause and action for error messages.

Error Message(English)：
desktop could not reach server

Resolution

How to resolve "git pull,fatal: unable to access 'https://github ...
https://stackoverflow.com/questions/27087483/how-to-resolve-git-pull-fatal-unable-to-access-https-gi・・・

GitHub Login and Enterprise URL issue
https://stackoverflow.com/questions/21231380/github-login-and-enterprise-url-issue

git with IntelliJ IDEA: Could not read from remote repository ...
https://stackoverflow.com/questions/27566999/git-with-intellij-idea-could-not-read-from-remote-repos・・・

GitHub - failed to connect to github 443 windows/ Failed to ...
https://stackoverflow.com/questions/18356502/github-failed-to-connect-to-github-443-windows-failed-t・・・

Can't sign in to GitHub Enterprise ・ Issue #2076 ・ desktop/desktop ...
https://github.com/desktop/desktop/issues/2076

Failure to login ・ Issue #3125 ・ desktop/desktop ・ GitHub
https://github.com/desktop/desktop/issues/3125

Github desktop is not opening ・ Issue #1638 ・ desktop/desktop ・ GitHub
https://github.com/desktop/desktop/issues/1638

desktop/desktop - GitHub
https://github.com/desktop/desktop/issues/2453

Unable to access repository over HTTPS ・ Issue #3713 ・ desktop ...
https://github.com/desktop/desktop/issues/3713