443 is https port … Either try accessing with https://IPADDRESS/Stats or change your port again to something like 8080.
Really weird for an ISP to block port 80 … they normally block 25 for spam control …anyway, try that.
Consumer isps will often block inbound 80 because theit TOS says you can’t host. They usually block other dirivitives such as 8080 too. I personally tunnel over ssh. You can also choose a non standard external port