Causes

• Cloudflare is unable to establish contact with your origin web server.

Fixes

A) From your origin web server

Step 1: Ensure Origin Server Responds To Requests

Ensure the origin server responds to requests for the hostname and domain within the visitor’s URL that generated the 502 or 504 error

Step 2: Investigate

Investigate excessive server loads, crashes, or network failures.

Step 3: Identify Applications Or Services

Identify applications or services that timed out or were blocked.

B) From Cloudflare

Step 1: Contact Cloudflare Customer Support

Provide the required details below to Cloudfare Customer Support:

• Time and time zone the issue occurred.
• URL that resulted in the HTTP 502 or 504 response (for example: https://www.example.com/images/icons/image1.png)
• Output from browsing to www.example.com/cdn-cgi/trace (replace www.example.com with the domain and host name that caused the HTTP 502 or 504 error)