DNS Records does not update or fetch resulting 523 even the site is reachable

What is the name of the domain?

ibmziue.com

What is the error number?

523

What is the error message?

Server Unreachable

What is the issue you’re encountering

Even tho i set the dns settings to point out to my server’s ip address which is 148., when i curl the url i see the ip addresses starting with 104. and these I assume is tied to cloudflare but actually that’s not my server’s ip address, so that I need to quickly resolve this issue as updating the records didn’t help

What steps have you taken to resolve the issue?

I updated dns records over and over again, utilized cloudflared tunnel on my server which works but dns names are misconfigured so that when use the command ( dig ibmziue.com +short ) it just lists numerous ip addresses from cloudflare but not the one that I registered to A AAAA CNAME records. Which just doesn’t make any efffect and change has been made a week ago. The site is currently reachable with explicit ip address

What feature, service or problem is this related to?

DNS records

What are the steps to reproduce the issue?

The mismatch of dns records

Can you share, perhaps a slightly redacted screenshot, of this?

If you’re running with a Cloudflare Tunnel, the public DNS hierarchy will see Cloudflare IP addresses, like you’re explaining.

Same happens with Proxied (:orange:) records.

1 Like

I get to see these :

$ curl -I https://www.ibmziue.com
curl -I https://ibmziue.com
HTTP/2 523
date: Tue, 22 Apr 2025 22:17:49 GMT
content-length: 0
server: cloudflare
cache-control: private, no-store
cf-cache-status: DYNAMIC
cf-ray: 93487e54190f0c9e-EWR
alt-svc: h3=“:443”; ma=86400

HTTP/2 301
date: Tue, 22 Apr 2025 22:17:49 GMT
location: https://www.ibmziue.com/
server: cloudflare
cf-ray: 93487e549f50556e-EWR
alt-svc: h3=“:443”; ma=86400

I just don’t understand the issue, I setup cloudflared on my mainframe which does have s390x architecture so I compiled from source but works perfectly fine, the environment that the mainframe is in does not allow 443 or standardized other ports so i am using 8081 but explicitly configured that on tunnel settings and apart from that properly applied page rules. The apache on the server side works just fine and I setup certificates perfectly fine and I verified them. The SSL/TLS configuration is on “Full” and then i just directly type "https://my_server_ip:8081 i can reach it out perfectly fine even I get this site is not safe , and I choose advanced option and choose proceed. So the site does work perfectly fine and functional but what I’ve done regards to the url to work, did not work as all I can say. The A and AAAA records are properly configurated like a week ago also . Sicne the environment that the mainframe is in blocks UDP, i disabled the the QUIC/UDP and I am just using TCP right now. It’s just weird and I couldn’t figure out the issue. I recreated the tunnel numerous times and I tried many many times which just didn’t work. So I really need assistance. Thanks!

  1. Share DNS records, as requested above.

  2. Share Cloudflare Tunnel logs.

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