Hello,

I would suggest removing and re-adding the remote through Cloud9. a git push should just be using your SSH, so if that works, it’s hard to say why it suddenly stopped working.

You can remove the remote with

git remote rm origin
git remote add origin user@droplet.ip:/path/to/repo

The sections marked in red should be changed to whatever you want to call your remote repo origin and the user, droplet ip(or hostname) and the path to the repository. Can you give this a try?