Server 2025 Std. as AD autentication server

AdminSys

A Zyxel Flex500 worked as an AD authentication server with a server 2012 std. After updating the server to 2025 it does not work, the error is Wrong Base DN or Bind DN. What could be the problem?

Zyxel_Melen

Hi @AdminSys

Please upgrade your firewall to V5.40 if you haven't upgraded. We fixed the Windows server 2025 connecting issue in V5.40. If the issue remains, please help to collect the diagnostic file and send it to me via the private message.

AdminSys

the file extension:

diaginfo-2025-07-18_10-24-43.tar.bz2

is not allowed to send for you :)

AdminSys

renamed to tar.gz and sent

Zyxel_Melen

Hi @AdminSys

Thanks for the diagnostic file. Let us have a quick check and I will keep you posted.

zyman2008

Hi @AdminSys

To work with windows 2005 authentication. The LDAP need to connect via TLS.

Change port to TCP 636 and enable "Use SSL" in the AD server setting page.

Zyxel_Melen

Hi @AdminSys

Just like @zyman2008 mentioned, you need to enable SSL/TLS for LDAPS for Windows server 2025. I checked your configuration and found you haven't change it. Please follow the configuration steps to edit your configuration and test again. Please feel free to let me know if you still have an issue.