GitLAv 14.8 fresh install, connection failed behind a reverse proxy


I upgraded Gitlab from 12 to 14.8 (Redhat 7) and I get a reset connection by peer when I try to access to Gitlab from Internet. Gitlab server is behind a proxy. I decided to try a fresh install on a Ubuntu 18.04 and I get the same error.

There is a dedicated nginx option or configuration with version later than 12 ?