Failure in post release GIT

Impossible to use Artifactory Release plugin part with github
I try with git on googlecode, that's work.
I let all the options by default. But I think plugin dont use credential informations.
For get clone credential is not requiered, but for push yes...

Failure in post build SCM action: Failed to push: Command "git push https://github.com/hhdevelopment/parent-pom.git refs/heads/REL-BRANCH-parent-pom-1.0.0" returned status code 128:
stdout:
stderr: fatal: Authentication failed