Not advice as such but it might be worth checking the following website if you have similar problems again. It checks to see if a website is down and also has a very limited troubleshooting page.
I checked rpol.net and had no problems so it might very well be a problem with not you, but your local network.
https://isitdownorjust.me/
troubleshooting page for isitdownorjustme
https://isitdownorjust.me/rpol.net/#trouble-shooting
EDIT: Checked the site again and just as I was loading some page... 404 error and I'm in Australia so it's not your local network. But some locations have access as the isitdownorjustme site claims it has no problems accessing rpol.