We updated our CI to use https, added the certs to the ssl/ folder and I deleted GitLab CI as an OAuth app and generated a new id and secret for it and reset it. Now, for all users, the redirect comes back to a 500 error, and now projects that are linked to the CI can communicate with the CI server. We see this error on the CI status
Cannot connect to the CI server. Please check your settings and try again.
I see this error in the gitlab-ci production.log
Faraday::SSLError (SSL_connect returned=1 errno=0 state=SSLv3 read server certificate B: certificate verify failed):