Describes the cause and action for error messages.
Error Message(English)：
https authentication failed
SSL Mutual Authentication in .NetCore 1.1 Kestrel #1344 - GitHub
https://github.com/aspnet/KestrelHttpServer/issues/1344
git - Maven JGitFlow plugin authentication for HTTPS - Stack Overflow
https://stackoverflow.com/questions/36189877/maven-jgitflow-plugin-authentication-for-https?rq=1
atlassian sourcetree - Authentication failed to bitbucket - Stack Overflow
https://stackoverflow.com/questions/20953940/authentication-failed-to-bitbucket/21712294
Bitbucket: is there some user password other than Atlassian password ...
https://stackoverflow.com/questions/40726439/bitbucket-is-there-some-user-password-other-than-atlass・・・