As an unreachable server is not a desirable situation, Cloudflare offers a series of tools & services to address this issue:
- Standalone Health Checks, notifies you as soon as we detect problems at your origin server, without needing a Cloudflare Load Balancer. Users on the Pro, Business, or Enterprise plan have access to Standalone Health Checks and Health Check Analytics. Access Standalone Health Checks and Health Check Analytics through the Traffic app in the Cloudflare dashboard.
- Passive Origin Monitoring, available to customers on all Cloudflare plans, lets you know when your origin cannot be reached, with no configuration required.
- Zero-Downtime Failover, the default behavior for customers on Pro, Business, and Enterprise plans, can automatically avert failures by retrying requests to origin.
Configure origin monitoring alerts for multiple email addresses in the Notifications Center of the Cloudflare dashboard.
Make certain your host is not rate limiting or blocking Cloudflare IPs, and check for errors in the log. If you’ve just moved to Cloudflare or for other troubleshooting suggestions, see the Community Tip - Fixing Error 521: Web server is down referenced below.
If you’re still having issues reaching the origin server, ask for advice & insight in the DNS & Network category on Community.Cloudflare.com.
If You Need More Help
This community of other Cloudflare users may be able to assist you, if not, login to Cloudflare and then contact Cloudflare Support. When you contact support, make sure to include as much of this information as possible: the specific error message your are seeing, the URLs this is happening on, screen shot of the error, steps to reproduce the error, and HAR file(s). Please indicate which of the Quick Fix Ideas you’ve tried in order to help Customer Support help you.
Expert Comments Appreciated
This Community Tip will remain open for input from Community experts and those familiar with this issue. We really appreciate comments like: “What are the three things to always try”, or “Do this first” or “In my experience”.
This is a Cloudflare Community Tip, to see other Community Tips, go here.
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