BindException: Permission denied in
journalctl -u ownsona.service, or Address already in use.
AmbientCapabilities. Check
/etc/systemd/system/ownsona.service has
AmbientCapabilities=CAP_NET_BIND_SERVICE. If not, the unit was
edited and lost the cap. Restore it from sql/ownsona.service.
sudo ss -tlnp | grep :443.
Often a leftover manually-launched Tomcat (startup.sh). Kill
it.
ownsona
user. ls -l /home/ownsona/tomcat/conf/tomcat.p12. Should be
owner=ownsona, mode 600.