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From: Jonathan Horne <freebsd@dfwlp.com>
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Date: Mon, 18 Dec 2006 22:08:53 -0600
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Subject: Re: Server Problem
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On Monday 18 December 2006 16:51, ossama abdel-haleem wrote:
> Dear Sir,
>   I have HP Proliant ML 370 G4 server with dual Processors 3.6 intel xeon
> and HP Smart RAID controller (Config=>RAID5) (146GB * 6) + (4 GB Of RAM.)
> The server working as application server (Tailored Software) based on
> POSTGRESQL server. I installed the FreeBSD 6.1 to serve 100 users with the
> application so - after period of time I found an error message appeared on
> the server : Kern. Maxfiles Limit Exceeded By UID 1001, Please See Tuning
> (7).
>
>   What is the problem? Can You Help Me because after this message appears
> the server activities down.
>
>   Thanks
>   Ossama Abdel Haleem

i think you must be referring to.  on my system, the default setting can be 
seen, like this:

[jhorne@athena ~]$ sysctl -a|grep kern.maxfiles
kern.maxfiles: 12328

in order to raise this, a line would be added to /boot/loader.conf, like this:
kern.maxfiles=24576

hth,
jonathan