Please try wget https://104.18.114.97
, if this one goes through I'd think the problem could be related to a faulty forwarding of regular internet traffic (port 80). If that fails as well I'd guess it's to due with the DHCP/Static IP's and involves your router. I'm absolutely clueless about Vodafone routers though.
Edit: Any connection would show "The certificate's owner does not match hostname ‘104.18.114.97’"
Here I've tried
wget https://104.18.114.97
. It's able to connect to the IP on port 443, but shows an error message since I'm not using a domain name. But at least I know I've reached the server.