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Anzine321's avatar
Anzine321
Icon for Cirrus rankCirrus
Jul 02, 2025
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Local login failed to access gui

Hi

i have an remote authentication using active directory, i tried to access gui and sah used local user and failed, fallback authentication is enable and fallback user is true

on log secure 

fallback is false ?

Anybody can help me

  • FYI

    F5 will not fallback to local authentication just because the user is missing in AD. Fallback to local only happens if the remote server is completely unreachable (network down, server offline, etc.), not if the server responds with "user not found" or "invalid password."

5 Replies

  • f51's avatar
    f51
    Icon for Cumulonimbus rankCumulonimbus

    Hi Anzine321​ 

    When you have remote authentication (like Active Directory) set up on Classic BIG-IP, the system will only use local accounts (fallback) if the remote server is completely unreachable (for example, if the AD server is down or the network is disconnected). If the remote server is up and just rejects your login, fallback to local does NOT happen—even if you enabled fallback in the settings. That’s why you see “fallback: false” in your logs.

     

    References:

    • Thanks for information

      i have a question, lets say account in active directory is not found, will f5 fallback to local ?

  • f51's avatar
    f51
    Icon for Cumulonimbus rankCumulonimbus

    FYI

    F5 will not fallback to local authentication just because the user is missing in AD. Fallback to local only happens if the remote server is completely unreachable (network down, server offline, etc.), not if the server responds with "user not found" or "invalid password."

    • Is there any option how to use both local and remote authentication ?

      • f51's avatar
        f51
        Icon for Cumulonimbus rankCumulonimbus

        By design, it's not possible to use both, remote and local authentication with other accounts besides root and admin. That means, that you can use the local root/admin account when you have set a remote authentication, but not other local accounts. You only can configure local authentication as backup if the remote authentication server fails.

        K20114289: Can I use both remote authentication and local authentication simultaneously?