Running into a UI down scenario, as recommended I deleted all the conf/cert files, and gotten nginx started, however the UI is still not accessible after box restart because of a missing cert and browsers refuse to connect with no override.
All apps are, of course, inaccessible too, until configs and certs can be regenerated.

On restart, box seems to recreate the /etc/nginx/applications/my.domain.conf BUT doesn't check if the /home/yellowtent/platformdata/nginx/certs/my.domain.host.cert is there to make sure the UI can come up.

Please add this check and create the cert if missing, and reload nginx.

This will make box more resilient.