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Operating Systems AIX AIX not following permission rules on group Post 302891607 by J-Man on Thursday 6th of March 2014 05:51:50 PM
Old 03-06-2014
Thanks everyone the issue is fixed. I removed three secondary groups from pcadmin and the file access resumed.

Cause was the NFS hard limit of 16 groups.
Quote:
If you use NFS, make sure you don't use more than 16 groups/user, this is a hard NFS limit. If you use NFS and have more than 16 groups/user you will end up with too few permissions on files (truncation after 16 groups) which can also mean people who should not be able to access files can access them, which may be a security problem.
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groups(1)						      General Commands Manual							 groups(1)

NAME
groups - show group memberships SYNOPSIS
[user] DESCRIPTION
shows the groups to which the caller or the optionally specified user belong. If invoked with no arguments, prints the current access list returned by (see getgroups(2)). Each user belongs to a group specified in the password file and possibly to other groups as specified in the files and A user is granted the permissions of those groups specified in and at login time. The permissions of the groups specified in are normally available only with the use of (see newgrp(1)). If a user name is specified with no options, prints the union of all these groups. The and options limit the printed list to those groups specified in and respectively. If a user name is not specified with any of these options, is called to determine the default user name (see cuserid(3S)). The printed list of groups is sorted in ascending collation order (see Environment Variables below). EXTERNAL INFLUENCES
Environment Variables determines the order in which the output is sorted. If is not specified in the environment or is set to the empty string, the value of is used as a default. If is not specified or is set to the empty string, a default of ``C'' (see lang(5)) is used instead of If any internationalization variable contains an invalid setting, behaves as if all internationalization variables are set to ``C'' (see environ(5)). EXAMPLES
Check file and display all groups to which user belongs: AUTHOR
was developed by the University of California, Berkeley. FILES
SEE ALSO
id(1), newgrp(1), getgroups(2), initgroups(3C), cuserid(3S), group(4). groups(1)
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