Hello,
 

I have installed Centreon central behind a proxy server
After that, I can not register my token.

• proxy config and test internet connection: success
• ping to api.imp.centreon.com: success
  ping api.imp.centreon.com
  PING api.imp.centreon.com (54.72.221.74) 56(84) bytes of data.
• curl : curl -s 'https://api.imp.centreon.com/v2/license-manager/instance/subscription' : success.
   curl -s 'https://api.imp.centreon.com/v2/license-manager/instance/subscription'
  {"message": "Authentication required"}e

But still have issue with license-manager.
Below is the log from  /var/log/centreon/license-manager.log :

<2025-09-03T18:04:38+07:00] ERROR : 0|0| RestNotFoundException] https://api.imp.centreon.com/v2/license-manager/instance : Page not found | {"custom":null,"exception":null,"dternal.php?object=centreon_license_manager&action=registerInstance","http_method":"POST","server":"x.x.x.x"}}}

nslookup api.imp.centreon.com
Server:         8.8.8.8
Address:        8.8.8.8#53

Non-authoritative answer:
Name:   api.imp.centreon.com
Address: 54.72.221.74
Name:   api.imp.centreon.com
Address: 18.202.168.35
Name:   api.imp.centreon.com
Address: 34.252.63.130

rpm -qa | grep centreon-web
centreon-web-24.10.12-1.el9.noarch
centreon-web-selinux-24.10.12-1.el9.noarch

Did someone can be check and help resolve the issue.
Thanks very much.
Xuan Lam