HTTP/3 (with QUIC) not working


I switched on HTTP/3 (with QUIC) about 10 days ago, and then I checked and it was working fine.

Today I check again, and it’s not working! I checked Cloudflare’s control panel and it is still on.

I get this message:


Could anyone explain me what could be happening? I did upgrade my server’s software (CentOS), WP, etc, but I reckon it has nothing to do with this issue.

Might be an issue with that service.

Your site checks out fine at Check if HTTP/3 is enabled - Geekflare Tools as well as on Firefox


Thanks Sandro!

It seems to be that isn’t working well. I didn’t even think that this could be the cause.

I donwloaded firefox nightly, that has an addon that shows http/3 pages, and mine has it activated. Also Check if HTTP/3 is enabled - Geekflare Tools.

Well, thanks for your time!