If you are monitoring with NewRelic Synthetics while using Cloudflare, you will not be able to properly detect a server down

[takagi.yuusuke]

Does anyone know how Cloudflare’s server response behaves when the Upstream server is down?
Also, when the Upstream server goes down, can’t we see somewhere in Cloudflare how long the problem has been going on?

[sandro]

You’ll get one of the 500s

Community Tip - Fixing 5XX Errors & All 5XX Tips

Introduction Use this Community Tip to understand more about 5XX errors, identify if they are from the origin server or the proxy, and click-through to supporting Community Tips for troubleshooting. Background Generally, 5xx error codes indicate that an error or unresolvable request occurred on the server side, whether that is a proxy or the origin host. The server was able to detect the error and thus will not return the potentially malformed response to the client. These error codes be used…