Stash Git error "fatal: remote error: CAPTCHA required"

This happened to me. I tried to remove sourcetree password file but didn't worked. I logout and login on bitbucket but didn't worked too. The thing that worked was to go to Panel Control on Windows and Credential Manager, I changed/removed all references to my git repo.

You might have a session to BitBucket open in a browser, that gives the impression that everything is fine. Simply logout and in again, when logging in you need to solve a CAPTCHA, after that you are good to go.

What worked for me was to go into: C:\Users\UserName\AppData\Local\Atlassian\SourceTree and delete the passwd file. Sourcetree was closed and I was logged out of bitbucket. I then logged back into bitbucket and solved the captcha. Then when I launched sourcetree and did a fetch I entered my password and all was well.

Another common issue with captcha warning seems to relate with password changes. Once your password is changed in the system you are authenticated with, both sourcetree and eclipse plug-in might have password conflict with the already logged in session on bitbucket, causing CAPTCHA authentication to activate.

Solution: Enter to your bitbucket session, logout and login again. If issue persist, then you might want to check the URL, since captcha activation would direct you to another direction and your user account with malfunctioning URL will raise authentication failures again and again.