Sometimes, SSH connection problems don't just disappear after refreshing Cloud9 several times. This can be due to Janitor containers not recognizing Cloud9's SSH key.
In this case, please make sure that your Janitor account contains the correct Cloud9 SSH public key (the Cloud9 username also helps us verify that you've successfully joined our Cloud9 Team Account "TheJanitor"):
A few notes:
The link below the text area allows you to make sure that the SSH public key you've authorized for your Janitor containers is actually the same that Cloud9 uses to connect.
The email at the end of the key gets stripped away (if you refresh your Janitor Account page, the email will disappear). This is not a problem, because SSH emails are comments anyway.
Any changes to your public key won't affect existing containers. If you realize that your authorized key is empty or has the wrong value, you'll need to delete any pre-existing containers and create new ones after you've fixed your SSH public key.