[SOLVED] Ubuntu 16.04 Nginx Mattermost TLS error

Troubleshooting
7

When I do lynx :8065
I am getting unsuppoerted URL scheme.

On laptop I get with http: �
with HTTPS: SSL_ERROR_INTERNAL_ERROR_ALERT

And the logs are not very verbose :frowning:

EDIT:
E.g. for nextcloud I have a nginx config file containing within the server tag

 # WARNING: Only add the preload option once you read about
     # the consequences in https://hstspreload.org/. This option
     # will add the domain to a hardcoded list that is shipped
     # in all major browsers and getting removed from this list
     # could take several months.
     add_header X-Content-Type-Options nosniff;
     add_header X-Frame-Options "SAMEORIGIN";
     add_header X-XSS-Protection "1; mode=block";
     add_header X-Robots-Tag none;
     add_header X-Download-Options noopen;
     add_header X-Permitted-Cross-Domain-Policies none;

Can this have a sideeffect?