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From: Mel <fbsd.questions@rachie.is-a-geek.net>
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Date: Mon, 16 Feb 2009 10:23:05 -0900
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Cc: Da Rock <rock_on_the_web@comcen.com.au>
Subject: Re: Old user can't log in
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On Thursday 12 February 2009 19:17:05 Da Rock wrote:

> I've been following this thread with interest: are you saying FreeBSD
> logins cannot handle more than 16 groups? If so, why? 

Because the kernel needs to keep this info. At the time of conception, 16 
shorts (16*4=64) per login and maxusers of 10, is only 640 bytes kernel 
memory. When working with 32MB physical memory per machine those 640 bytes 
sound a lot more invasive.
The variable is defined in sys/sys/syslimits.h, in case you need to tune your 
kernel.

In any case, work is being done to make this a sysctl runtime tuneable:
http://lists.freebsd.org/pipermail/freebsd-hackers/2009-February/027738.html
-- 
Mel

Problem with today's modular software: they start with the modules
    and never get to the software part.