gitlab repo sync to github repo faild

[stardustman]

I start a gitlab instance use this docker-gitlab. when I config the mirror of gitlab's repo, the mirror sync to github failed.

13:push to mirror: git push: exit status 128, stderr: "fatal: unable to access 'https://github.com/gh-id/repo.git/': GnuTLS recv error (-110): The TLS connection was non-properly terminated.\n".

I have tried many times, it still failed. what's the reason? Is there something wrong with GnuTLS? How to resolve it? Please help me. Thanks a lot.