GitLab: Failed to authorize your Git request: internal API unreachable

Hello!
I just make an install of gitlab on a existing nginx server. I install the SSL certificate with let’s encrypt for all my domain and subdomains.
I can access to gitlab without any problem. I can create some project too BUT when i try to commit one file, i’ve the following error :

GitLab: Failed to authorize your Git request: internal API unreachable

The log in /var/log/gitlab/gitlab-shell/gitlab-shell.log give me the following:

time="2018-12-18T15:59:30+01:00" level=warn msg="Failed to connect" error="Failed to open TCP connection to 127.0.0.1:8080 (Connection refused - connect(2) for \"127.0.0.1\" port 8080)" method=POST pid=23378 url="http://127.0.0.1:8080/api/v4/internal/allowed" time="2018-12-18T15:59:30+01:00" level=info msg="finished HTTP request" duration=0.000809351 method=POST pid=23378 url="http://127.0.0.1:8080/api/v4/internal/allowed"

Can you help me pls? I’ve no idea of what goes wrong :frowning: