This previously used to work.

journalctl -xn shows the following:

-- Unit nginx.service has begun starting up.
Jan 01 04:54:02 hostname dbus-daemon[449]: dbus[449]: [system] Reloaded configuration
Jan 01 04:54:02 hostname dbus[449]: [system] Reloaded configuration
Jan 01 04:54:04 hostname kernel: type=1400 audit(1388580844.706:42): avc:  denied  { execstack } for  pid=6670 comm="nginx" scontext=
Jan 01 04:54:04 hostname nginx[6670]: /usr/sbin/nginx: error while loading shared libraries: libk5crypto.so.3: cannot enable executab
Jan 01 04:54:04 hostname systemd[1]: nginx.service: control process exited, code=exited status=127
Jan 01 04:54:04 hostname systemd[1]: Failed to start The nginx HTTP and reverse proxy server.
-- Subject: Unit nginx.service has failed