Can't Connect to my cockpit from my domain

Hi everyone !

I configured my cockpit behind a nginx reverse proxy, and I activated HTTPS with certbot.
Sadly, I can access the connection page from cockpit, but it is impossible to connect to it…
I created a cockpit.conf file with:

[WebService]
Origins = https://supervision.neilz.ovh wss://supervision.neilz.ovh
ProtocolHeader = X-Forwarded-Proto

Also I don’t find anything interesting in the logs:

Jun 13 10:11:20 ubuntu cockpit-session[2478]: pam_unix(cockpit:auth): authentication failure; logname= uid=0 euid=0 tty= ruser= rhost=::ffff:127.0.0.1 user=ubuntu
Jun 13 10:11:24 ubuntu wpa_supplicant[645]: wlan0: Failed to initiate sched scan
Jun 13 10:11:31 ubuntu wpa_supplicant[645]: wlan0: Failed to initiate sched scan
Jun 13 10:11:31 ubuntu cockpit-session[2481]: pam_ssh_add: Failed adding some keys
Jun 13 10:11:31 ubuntu cockpit-session[2481]: pam_unix(cockpit:session): session opened for user ubuntu(uid=1000) by (uid=0)
Jun 13 10:11:31 ubuntu systemd-logind[828]: New session 11 of user ubuntu.
Jun 13 10:11:32 ubuntu systemd[1]: Started Session 11 of User ubuntu.
Jun 13 10:11:33 ubuntu polkitd(authority=local)[810]: Registered Authentication Agent for unix-session:11 (system bus name :1.163 [cockpit-bridge], object path /org/freedesktop/PolicyKit1/AuthenticationAgent, locale C.UTF-8)

Except this line:

Jun 13 10:11:31 ubuntu cockpit-session[2481]: pam_ssh_add: Failed adding some keys

Thanks in advance