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In the last several months I have been noticing frequent 520 errors with both my QUIC DNS and Cloudflare integrated CDN sites. Neither my host (NameCheap) or the QUIC support is able to solve this. It’s essentially finger pointing on both sides regarding the cause of the problem. QUIC says they are not whitelisting the IPs needed, and NC says all looks good on their end. Until recently I was enjoying the service, but show stopper errors that scare visitors away is a no go. Frustrating all around.
Curious if there are other NC users experiencing this? Also what might have happened that these errors suddenly started popping up on all my QUIC websites?
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I use Namecheap. Mostly their VPS servers but some shared servers too. I’ve not noticed any QUIC.cloud errors.
I use OLS on one server and Apache+NginX on the other VPS servers. All servers use PHP LSAPI. The non VPS servers are configured to use LiteSpeed according to cPanel (seems to be the standard setup with Namecheap now).
All but one site uses the LS cache plugin and that plugin is configured to use QUIC.cloud integration although only for free basic services (I have a paid plan but rarely top it up).
On the VPS servers I needed to whitelist the [QUIC.cloud]) service’s IP addresses in CF Config.
On the shared servers I might have disabled or changed the settings of the ModSecurity. I don’t fully recall.
Have you tried to reproduce the errors with Cloudflare taken out of the equation?