This bug travels from version to version for a decade now.
If you clone a repository via ssh via external means (in my case, Git Bash on win), Netbeans' git module fails to work with it ("Auth fail" with the correct and working private key provided).
Steps to reproduce:
- open Git Bash, clone a repository via ssh;
- open this project in Netbeans;
- try to pull; fail.
There's an annoying workaround of re-cloning the repository from inside Netbeans I'm aware of. But maybe it's finally time for this ancient bug to go.