Forum Discussion

Bravo's avatar
Bravo
Icon for Nimbostratus rankNimbostratus
Feb 26, 2024

APM - authentication does not work when pool of AD servers are used

Dear All I am facing issue with APM AD authentication.   Access  ››  Authentication  When i use single AD server, authentication works fine. The moment i change to pool of AD servers, it sto...
application delivery
Bravo's avatar
Bravo
Icon for Nimbostratus rankNimbostratus

Dear Amine

Please see the configurations.

The one used as "pool" is not working

The one used as "Direct" is working.

 

The logs shows as below:

 01490010:5: /Common/Azure_AD_Servers:Common:f040bbbf: Username ''
Feb 25 13:19:24 exlb-f502.azure.com err apmd[14492]: 01490107:3: /Common/Azure_AD_Servers:Common:fb31d8a4: AD module: authentication with 'xxxx' failed: Cannot contact any KDC for realm 'ZZZ.COM', principal name: arul@ZZZ.COM  (-1765328228)

 

Thank you

Arul

KeesvandenBos's avatar
KeesvandenBos
Icon for MVP rankMVP
Feb 27, 2024

What is the status of the pool member?
I also think you should use a tcp health monitor with port 88 to make sure the DC is up and running.

  • Bravo's avatar
    Bravo
    Icon for Nimbostratus rankNimbostratus
    Feb 27, 2024

    In the pool i am using single IP ( which is the same IP , when i use DIRECT)

     

    In logs i notice this - 

    : /Common/Azure_AD_Servers:Common:a9df6506: Session variable 'session.ad.last.errmsg' set to 'Cannot contact any KDC for realm 'xxx.COM', principal name: arul@xxx.COM'

     

    I have checked DNS and ntp settings too, still no good

     

    Thank you

    • Amine_Kadimi's avatar
      Amine_Kadimi
      Icon for MVP rankMVP
      Feb 27, 2024

      I second KeesvandenBos on the health monitor. Additionally, I would not use any health monitor while troubleshooting, and instead use tcpdump and filter for traffic between APM and DCs and look for any packets going from APM to DC but not receiving any answer, look in particular for port 389 and 88.