_Something_ is blocking port 80.
$ nmap -sT 81.10.248.112 -p 80 -Pn
Starting Nmap 7.01 ( https://nmap.org ) at 2018-03-02 11:38 PST Nmap scan report for cm248-112.liwest.at (81.10.248.112) Host is up. PORT STATE SERVICE 80/tcp filtered http
Nmap done: 1 IP address (1 host up) scanned in 3.56 seconds
If you're behind a router doing NAT, you'll need to forward the DirPort and ORPort ports.