Error code 502 «Visit cloudflare.com for more information» on Imunify360 GUI

Issue

Error code 502 «Visit cloudflare.com for more information» on Imunify360 GUI:

Environment

• Imunify360
• Cloudflare

Cause

Dashboard URL works via Cloudflare:

$ ping server.domain.com
PING server.domain.com (172.66.40.88) 56(84) bytes of data.
64 bytes from 172.66.40.88 (172.66.40.88): icmp_seq=1 ttl=59 time=26.8 ms

$ whois 172.66.40.88 |grep Organization
Organization:   Cloudflare, Inc. (CLOUD14)

Solution

Use a dashboard URL that resolves directly to the server's IP address or the IP address itself.