Some users are complaining about invalid certificate and thus no closed padlock icon. When I check from Chrome it says this site is not secure, but the certificate is a valid LetsEncrypt . Checking on https://www.digicert.com/help/ all seems fine.
sorry for my bad english. I'm actually creating a fresh infra to test alfresco using a pfsense in front. Using port-forwarding solution is not a good practice. The best way is to use a reverse proxy on top of alfresco (haproxy). pfsense can provide haproxy and use let's encrypt with acme, or you can forward all request to a reverse proxy component (apache, nginx, haproxy, etc) in front of alfresco