strange 'too many open files' errors with nginx 0.6.32

[Arash Ferdowsi]

hi,i'm seeing a strange 'too many open files' error with nginx (which I'm
sure many of you have seen before):

2008/11/17 02:15:02 [alert] 21748#0: accept() failed (24: Too many open
files) while accepting new connection on 67.228.78.114:80

strangely enough, I have the following line in /etc/security/limits:
* hard nofile 524288

and ulimit -n returns the same number. I have 2 workers set to a max
of 262144 connections. upon receiving that error (and after
past occurrences) I've run lsof and gotten < 10k sockets. additionally, I
have a nearly identically configured machine (running twisted) where each
process is handling ~15k connections. so I'm a loss as to what's going on
here (and suspect some subtle bug in nginx or in my server configuration.
any help would be greatly appreciated!


-- 
Arash Ferdowsi
CTO, Dropbox
913.707.5875 (m)
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