d. Take note of the options for renewing Letsencrypt certificates and implement an appropriate strategy.
###### Test HTTPS access
###### Test HTTPS access
Once you have a certificate at `etc/tls/fullchain.pem` and private key at `etc/tls/privkey.pem`, you should be able to access ztncui over HTTPS on the port specified by HTTPS_PORT.
Once you have a certificate at `etc/tls/fullchain.pem` and private key at `etc/tls/privkey.pem`, you should be able to access ztncui over HTTPS on the port specified by HTTPS_PORT.