Why do some sites take forever to load when using Pi-hole? (for versions < v4.0)

FAQs
, ,
18

Hey all,

I was struggling with intermittent slow-loading for a while too and finally found my solution.
Some sites (ex: www.googletagservices.com) are starting to use the QUIC protocol, which functions over UDP.
Blocking 80/443 UDP takes care of that, and TCP is best served with a tcp-reset.

iptables -A INPUT -p tcp --dport 443 -j REJECT --reject-with tcp-reset
iptables -A INPUT -p udp --dport 80 -j REJECT --reject-with icmp-port-unreachable
iptables -A INPUT -p udp --dport 443 -j REJECT --reject-with icmp-port-unreachable

If you're using IPv6, match your ip6tables.

Hope this helps someone out there!
Thanks.

2 Likes