[Ubuntu Server] could not connect to apt.radxa.com

When I type:" sudo apt update" in terminal. For the first 5 sources from ubuntu-ports, they are fine. But when it tried to connect to apt.radxa.com, it said:
“Could not connect to apt.radxa.com:80 ( - connect (113: No route to host)”
Someone know how to fix this?

Try ping apt.radxa.com

ping apt.radxa.com
PING radxa.github.io ( 56 data bytes
64 bytes from icmp_seq=0 ttl=54 time=127.430 ms
64 bytes from icmp_seq=1 ttl=54 time=129.977 ms
64 bytes from icmp_seq=2 ttl=54 time=131.130 ms

It’s hosted on github and cloudflare for the dns.

Hi Jack,
it said “Desination Host Unreachable” many times. I can’t even access to this website with my rock pi.

Ah, it works with wifi now . However, I dont understand, when I connected it with ethernet cable, it didnt work at all.