These modules will block any time an IP that connects more than 22 times.
If you are running custom Apache modules, such as mod_antiloris and mod_reqtimeout, disable and unload the modules. mod_security’s core rules aren’t blocking Cloudflare requests. Make sure that you’re operating off of the most recent versions of Bad Behavior or mod_security. Make sure your hosting provider isn’t rate limiting or blocking IP requests from the Cloudflare IPs and ask them to whitelist the IP addresses. Make sure that you’re not blocking Cloudflare IPs in.
If this is not possible, you can move to using ‘Flexible’ SSL under the SSL/TLS app on the dashboard. In this case you should configure your server/firewall to being listening on port 443 and allow us to be able to conect. If you have just moved to Cloudflare and you are seeing a 521 over HTTPS, it is possible that your origin server has not been configured to allow port 443 be accessed by Cloudflare IPs. If you’re unable to perform these tasks, contact your hosting provider.
The origin web server might not be running in that case you should: a) Ensure your web server is running normally and b) Review the server’s error logs to see what is causing the error.
Chrome on mac gets 502 error for website software#
This is often caused by security or firewall software and happens if the origin server has directly refused Cloudflare’s proxy request.Ĭheck your origin web server. Specifically, Cloudflare tried to connect to your origin server on port 80 or 443, but received a connection refused error. Try the suggestions in this Community Tip to help you fix Error 521: Web server is down.Ī 521 error happens when we are unable to make a TCP connection to your origin server.
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