Server 2025 Std. as AD autentication server

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AdminSys
AdminSys Posts: 36  Freshman Member
First Comment Seventh Anniversary

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?

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  • Zyxel_Melen
    Zyxel_Melen Posts: 3,526  Zyxel Employee
    Zyxel Certified Network Engineer Level 1 - Switch Zyxel Certified Network Administrator - Switch Zyxel Certified Network Administrator - Nebula Zyxel Certified Sales Associate

    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.

    Zyxel Melen


  • AdminSys
    AdminSys Posts: 36  Freshman Member
    First Comment Seventh Anniversary

    the file extension:

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

    is not allowed to send for you :)

  • AdminSys
    AdminSys Posts: 36  Freshman Member
    First Comment Seventh Anniversary

    renamed to tar.gz and sent

  • Zyxel_Melen
    Zyxel_Melen Posts: 3,526  Zyxel Employee
    Zyxel Certified Network Engineer Level 1 - Switch Zyxel Certified Network Administrator - Switch Zyxel Certified Network Administrator - Nebula Zyxel Certified Sales Associate

    Hi @AdminSys

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

    Zyxel Melen


  • zyman2008
    zyman2008 Posts: 232  Master Member
    25 Answers First Comment Friend Collector Seventh Anniversary
    edited July 18

    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.

    image.png
  • Zyxel_Melen
    Zyxel_Melen Posts: 3,526  Zyxel Employee
    Zyxel Certified Network Engineer Level 1 - Switch Zyxel Certified Network Administrator - Switch Zyxel Certified Network Administrator - Nebula Zyxel Certified Sales Associate

    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.

    Zyxel Melen