Cloudflare giving 502 bad gateway since today

Hi community,

We have a VPS running a big multi-site platform. This platform is using cloudflare for Ddos protection and load balancing, URL is

The problem is that since this morning cloudflare is giving the error:

We debugged the whole VPS and not a single error is found. What could be the issue? It started happening 8:49 GMT+2 today and since than the site goes on- and offline from time to time.

We are clueless right now. Any help is appreciated, thanks in advance.

502s are covered at Community Tip - Fixing Error 502 / 504: Bad Gateway.

Does your server IP address end in 2? If so, you

  1. Have an expired certificate on your server
  2. Get that 502 straight from your server

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