Cockpit-ws: couldn't read from connection: Peer sent fatal TLS alert: Unknown certificate

Note: There is a file: /etc/cockpit/ws-certs.d/99-nethserver.cert.

But I have in /var/log/messages:

XXX XX XX:XX:XX server systemd: Starting Cockpit Web Service…
XXX XX XX:XX:XX server systemd: Started Cockpit Web Service.
XXX XX XX:XX:XX server cockpit-ws: Using certificate: /etc/cockpit/ws-certs.d/99-nethserver.cert
XXX XX XX:XX:XX server cockpit-ws: couldn’t read from connection: Peer sent fatal TLS alert: Unknown certificate
XXX XX XX:XX:XX server cockpit-session: pam_ssh_add: Failed adding some keys
XXX XX XX:XX:XX server systemd: Started Session 3 of user root.
XXX XX XX:XX:XX server systemd-logind: New session 3 of user root.
XXX XX XX:XX:XX server cockpit-ws: logged in user session
XXX XX XX:XX:XX server cockpit-ws: couldn’t read from connection: Peer sent fatal TLS alert: Unknown certificate
XXX XX XX:XX:XX server cockpit-ws: couldn’t read from connection: Peer sent fatal TLS alert: Unknown certificate
XXX XX XX:XX:XX server cockpit-ws: couldn’t read from connection: Peer sent fatal TLS alert: Unknown certificate
XXX XX XX:XX:XX server cockpit-ws: couldn’t read from connection: Peer sent fatal TLS alert: Unknown certificate
XXX XX XX:XX:XX server cockpit-ws: couldn’t read from connection: Peer sent fatal TLS alert: Unknown certificate
XXX XX XX:XX:XX server cockpit-ws: couldn’t read from connection: Peer sent fatal TLS alert: Unknown certificate
XXX XX XX:XX:XX server cockpit-ws: New connection to session from XXX.XXX.XXX.XX
XXX XX XX:XX:XX server dbus[747]: [system] Activating via systemd: service name=‘org.freedesktop.timedate1’ unit=‘dbus-org.freedesktop.timedate1.service’
XXX XX XX:XX:XX server dbus[747]: [system] Activating via systemd: service name=‘org.freedesktop.realmd’ unit=‘realmd.service’
XXX XX XX:XX:XX server dbus[747]: [system] Activating via systemd: service name=‘org.freedesktop.hostname1’ unit=‘dbus-org.freedesktop.hostname1.service’
XXX XX XX:XX:XX server systemd: Starting Hostname Service…
XXX XX XX:XX:XX server systemd: Starting Realm and Domain Configuration…
XXX XX XX:XX:XX server systemd: Starting Time & Date Service…
XXX XX XX:XX:XX server dbus[747]: [system] Successfully activated service ‘org.freedesktop.timedate1’
XXX XX XX:XX:XX server dbus[747]: [system] Successfully activated service ‘org.freedesktop.hostname1’
XXX XX XX:XX:XX server systemd: Started Time & Date Service.
XXX XX XX:XX:XX server systemd: Started Hostname Service.
XXX XX XX:XX:XX server dbus[747]: [system] Successfully activated service ‘org.freedesktop.realmd’
XXX XX XX:XX:XX server systemd: Started Realm and Domain Configuration.
XXX XX XX:XX:XX server cockpit-bridge: No entry for terminal type “unknown”;
XXX XX XX:XX:XX server cockpit-bridge: using dumb terminal settings.

If found a second problem:
With Opera (and all Chromium based I think), when we launch the https://IP:9090/ opens a dialog window in more https login page.
This dialog box does not work (Username/Password).

XXX XX XX:XX:XX server cockpit-ws: couldn’t read from connection: Peer sent fatal TLS alert: Unknown certificate
XXX XX XX:XX:XX server cockpit-ws: cockpit-session: gssapi auth failed: An unsupported mechanism was requested (Unknown error)

A third:

XXX XX XX:XX:XX server cockpit-ws: couldn’t read from connection: Peer sent fatal TLS alert: Unknown certificate
XXX XX XX:XX:XX server /usr/libexec/nethserver/api/system-apps/update[7198]: /var/lib/nethserver/db/configuration: OLD cockpit.socket=configuration|HideUninstall|disabled|LimitAccess||Pins||Shortcuts||ShowHints|enabled|access|green,red
XXX XX XX:XX:XX server /usr/libexec/nethserver/api/system-apps/update[7198]: /var/lib/nethserver/db/configuration: NEW cockpit.socket=configuration|HideUninstall|disabled|LimitAccess||Pins|nethserver-httpd|Shortcuts||ShowHints|enabled|access|green,red
XXX XX XX:XX:XX server /usr/libexec/nethserver/api/system-apps/update[7208]: /var/lib/nethserver/db/configuration: OLD cockpit.socket=configuration|HideUninstall|disabled|LimitAccess||Pins|nethserver-httpd|Shortcuts||ShowHints|enabled|access|green,red
XXX XX XX:XX:XX server /usr/libexec/nethserver/api/system-apps/update[7208]: /var/lib/nethserver/db/configuration: NEW cockpit.socket=configuration|HideUninstall|disabled|LimitAccess||Pins|nethserver-httpd|Shortcuts|nethserver-httpd|ShowHints|enabled|access|green,red
XXX XX XX:XX:XX server cockpit-ws: couldn’t read from connection: Peer sent fatal TLS alert: Unknown certificate
XXX XX XX:XX:XX server cockpit-ws: couldn’t read from connection: Peer sent fatal TLS alert: Unknown certificate
XXX XX XX:XX:XX server cockpit-ws: couldn’t read from connection: Peer sent fatal TLS alert: Unknown certificate
XXX XX XX:XX:XX server cockpit-ws: couldn’t read from connection: Peer sent fatal TLS alert: Unknown certificate
XXX XX XX:XX:XX server cockpit-ws: couldn’t read from connection: Peer sent fatal TLS alert: Unknown certificate
XXX XX XX:XX:XX server cockpit-ws: couldn’t read from connection: Peer sent fatal TLS alert: Unknown certificate
XXX XX XX:XX:XX server cockpit-ws: couldn’t read from connection: Peer sent fatal TLS alert: Unknown certificate
XXX XX XX:XX:XX server cockpit-ws: couldn’t read from connection: Peer sent fatal TLS alert: Unknown certificate
XXX XX XX:XX:XX server cockpit-ws: couldn’t read from connection: Peer sent fatal TLS alert: Unknown certificate
XXX XX XX:XX:XX server cockpit-ws: couldn’t read from connection: Peer sent fatal TLS alert: Unknown certificate
XXX XX XX:XX:XX server cockpit-ws: couldn’t read from connection: Peer sent fatal TLS alert: Unknown certificate