AD Authentication Failed after upgrade to 5.40 on USGFLEX700 model only

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rv_faro
rv_faro Posts: 3  Freshman Member
First Comment Friend Collector
edited June 4 in Security

hi everybody,
after upgrading to ZLD 5.40 on USGFLEX700 (Standalone mode) we got systematic authentication failure using AD Authentication against windows server 2019 Domain Controllers (so this shouldn't have nothing to do with the Windows Server 2025's problem as of Zyxel's advisory of last April)
We've verified that on other models (e.g. USGFLEX500) AD authentication works fine.
We asked to some other companies we are in touch to and they confirmed to us that they had the same problem on USGFLEX700 model.
Now I'm in touch with support who are trying to deal with it.

Since I don't see anything about that problem in community i'd like to ask if there's anyone else who've got the same problem.

thank you all in advance for yr feedbacks.

Regards

Renato

Accepted Solution

  • Zyxel_Judy
    Zyxel_Judy Posts: 2,317  Zyxel Employee
    Zyxel Certified Network Engineer Level 2 - Nebula Zyxel Certified Network Engineer Level 2 - Switch Zyxel Certified Network Engineer Level 2 - Security Zyxel Certified Network Engineer Level 1 - Nebula
    Answer ✓

    Hi @rv_faro ,

    Thank you for confirming that AD authentication in SSL VPN with "ext-group-users" is working properly with our solution.

    Zyxel_Judy

All Replies

  • Zyxel_Judy
    Zyxel_Judy Posts: 2,317  Zyxel Employee
    Zyxel Certified Network Engineer Level 2 - Nebula Zyxel Certified Network Engineer Level 2 - Switch Zyxel Certified Network Engineer Level 2 - Security Zyxel Certified Network Engineer Level 1 - Nebula

    Hi @rv_faro ,

    We were unable to reproduce this issue at our location with USG FLEX 700 5.40 and Windows Server 2019, Windows Server 2025 as AD server.

    To provide better support, could you please provide remote session access to your USG FLEX 700H (firmware version 5.40) so we can investigate further? We will send the detailed instructions for establishing the remote session to your community inbox.

    Zyxel_Judy

  • Zyxel_Judy
    Zyxel_Judy Posts: 2,317  Zyxel Employee
    Zyxel Certified Network Engineer Level 2 - Nebula Zyxel Certified Network Engineer Level 2 - Switch Zyxel Certified Network Engineer Level 2 - Security Zyxel Certified Network Engineer Level 1 - Nebula

    Hi @rv_faro ,

    Thank you for your private message providing detailed information about the issue. We now understand that the authentication problem occurs specifically with SSL VPN when authenticating against "ext-group-users" configured to authenticate with Active Directory.

    Thank you also for providing remote access to allow our team to investigate the issue directly. We have confirmed the problem and are currently working on a solution.

    Zyxel_Judy

  • Zyxel_Judy
    Zyxel_Judy Posts: 2,317  Zyxel Employee
    Zyxel Certified Network Engineer Level 2 - Nebula Zyxel Certified Network Engineer Level 2 - Switch Zyxel Certified Network Engineer Level 2 - Security Zyxel Certified Network Engineer Level 1 - Nebula
    Answer ✓

    Hi @rv_faro ,

    Thank you for confirming that AD authentication in SSL VPN with "ext-group-users" is working properly with our solution.

    Zyxel_Judy

  • SaFraNET_Vanik
    SaFraNET_Vanik Posts: 2  Freshman Member
    First Comment Friend Collector
    https://community.zyxel.com/en/discussion/comment/78096#Comment_78096

    Hi,

    I am encountering same troubles. What should I do? Thank you.

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