Mar 27, 2026 - For details about updated CVE-2025-53521 (BIG-IP APM vulnerability), refer to K000156741.

Forum Discussion

TedNetx_375119's avatar
TedNetx_375119
Icon for Nimbostratus rankNimbostratus
Feb 03, 2019

Authentication Failure - NTLM on Big IP LTM

Hi all F5 gurus.   I have an environment, in which clients hit a virtual server ( http for NTLM authentication) all domain users need to be silently authenticated through NTLM. After authenticatio...
application delivery
BIG-IP Access Policy Manager (APM)
LTM
boneyard's avatar
boneyard
Icon for MVP rankMVP
Feb 03, 2019
  • Simple virtual servers without any policy - Failed.

that makes sense, without any profiles it won't do it automatically.

 

  • Config an NTLM auth and an APM access policy and applied to virtual server- Failed

did you set NTLM auth up according to any guides? this one perhaps?

 

https://devcentral.f5.com/articles/configuring-apm-client-side-ntlm-authentication

 

add a recent post on this repeating what you need, do you have all that?

 

https://devcentral.f5.com/questions/ntlm-authentication-in-apm-58716

 

  • Used an irule in addition to step 2 above - Failed

which iRule did you use?