Hello there,
before you tell me that there’s lots of similar topics. I have that problem from a few days. Got 521 error just like that and since then it hasn’t fixed itself.
I tried to purge cache, rebooting instance, creating new with snapshot, pausing Cloudflare on site, edited htaccess to allow IPs from Cloudflare, been turning off and on (flexible, full, strict) ssl modes. Nothing worked, lightsails’ metrics’ are on low. Looks like it might be on lightsail end, but god damn it, I just even can’t open a ticket.
Can someone help me with this?