ACME challanges fail with 404 in a clusted setup behind a f5

[thoeng-nuuday]

Hi,

I'm setting up ejabberd, on Ubuntu 22.04.5 LT version ejabberd/now 25.04-1.
Using Mnesia as the database.

Each ejabberd have the same configuration, all nodes are in the same cluster. The f5 is configured as a proxy and do not offload ssl.

When multiple servers are in the cluster, the acme challanges fails with an 404

2025-08-21 14:21:53.785360+02:00 [error] <0.538.0>@ejabberd_acme:issue_request/7:252
 Failed to request certificate for xmpp-test.example.com:
 Challenge failed for domain xmpp.example.com:
 ACME server reported: 9 1.219.154.82:
 Invalid response from http://xmpp.example.com/.well-known/acme-challenge/KVE-s-4-XXXXXXX:
 404 (error type: unauthorized)

Does ejabberd acme not support acme in a clustered setup where each node request the certificate, I would presume the ejabberd handle the callback from any node in the cluster.

Or is there missing any additional configuration for handling acme in a clustered setup. ?

cheers
Thomas

Note: the domain has been changed to not leak info.

hosts: 
 - xmpp.example.com
listen:
 - 
    module: ejabberd_http
    port: 5280
    tls: false
    request_handlers:
       /.well-known/acme-challenge: ejabberd_acme
    ## mapped from f5 lb  to 5280
acme:
  auto: true 
  contact:
    - "mailto: XXX@example.com"
  ca_url:  "https://acme-v02.api.letsencrypt.org/directory"