AIX can be integrated in to Active Directory in two ways: via Samba’s winbind directly as a Windows machine, and indirectly via LDAP.
The winbind configuration was already covered in a previous posting and worked rather well. However, because of GE’s requirements, it was not possible to utilize the winbind method for Active Directory integration. [...]

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By default, AIX 5.3 has a user name length limitation of 8 characters, regardless of the back end authentication mechanism.
To confirm this, run:
getconf LOGIN_NAME_MAX
or
lsattr -El sys0 -a max_logname
To set the size limitation to a new (higher) value, run (where # is the new maximum user name length):
chdev -l sys0 -a max_logname=#

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