Question
Cloudfare Host is down error 521
- Posted on March 7, 2021
- Server OptimizationWordPress
Asked by domaindomaindm
i added ip4 of cloudfare into iptables but still when i go to my website using https i get Error 521 : Web server is down. Please help its urgent
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Hello there,
Error 521 occurs when the origin web server refuses connections from Cloudflare. Security solutions at your origin may block legitimate connections from certain Cloudflare IP addresses.
You can also make sure that port 443 is open with this command:
Also, you can check our tutorial for whitelisting IPs with iptables:
Regards, Alex