I tried to install emacs on my laptop but the package manager failed. When I go to gnu.org/software/emacs nothing ever loads and I get a timeout error. I tried on my phone. Same thing. Turned off WiFi and tried to go to gnu.org on mobile data, it loaded instantly.
Only noticed after I recently installed cachyos on my laptop. Hhhmm I’m going to try on VPN and see what happens
Check if nslookup is returning the correct IP address for the domain.
Try using DNS over HTTPS (DoH). https://quad9.net/news/blog/doh-with-quad9-dns-servers/
Check for overzealous nanny features (cloud filtering, dns filtering, exotic proxy settings) on the router.