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

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MikeIs_61713's avatar
MikeIs_61713
Icon for Nimbostratus rankNimbostratus
Aug 02, 2011

Active Directory AAA server failing when just specify the domain name

Hi,     I am trying to setup an Active Directory AAA server on a BIG-IP Edge gateway to use when connecting to a web application. In defining the AAA server, I would just like to give the doma...
app sec
BIG-IP Access Policy Manager (APM)
security
MikeIs_61713's avatar
MikeIs_61713
Icon for Nimbostratus rankNimbostratus
Aug 08, 2011
Solution: The following seemed to fix the problems

1. Allow LDAP UDP through firewall

2. Update /etc/krb5.conf on the BIG-IP to enable dns lookup for the realm and kdc 

 [libdefaults]
           default_realm = EXAMPLE.COM
           dns_lookup_realm = false
           dns_lookup_kdc = false
           ticket_lifetime = 24h
           forwardable = yes

This then impacted AD Queries for authorisation, and we had to ensure that DNS could resolve both
    _kerberos-master._udp
    _kerberos._udp