Server is up, but i see 502 and 521 error on chrome and firefox

[sdayman]

5xx errors happen when your server doesn’t respond properly to Cloudflare. Logs at your host should help narrow this down. Here’s more information:

Community Tip - Fixing Error 521: Web server is down

Error Try the suggestions in this Community Tip to help you fix Error 521: Web server is down. Background A 521 error happens when we are unable to make a TCP connection to your origin server. Specifically, Cloudflare tried to connect to your origin server on port 80 or 443, but received a connection refused error. This is often caused by security or firewall software and happens if the origin server has directly refused Cloudflare’s proxy request. [Banner in tip catalog] Quick Fix Ideas …