slapd hang once a day

[antidotez@catcha.com]

recently, ldap (slapd) has been giving problem. it will 
hang at least once every day and needs manual killing 
and restaring. below is an entry from log file:
"Jul 10 09:21:55 testserver slapd[19503]: warning: 
cannot open /etc/hosts.allow: Toomany open files"

would appreciate if someone could advise on the 
cause for "cannot open /etc/hosts.allow" and "too many 
open files" and the solution to the hanging problem.

is there any tool/prog that can be used to monitor slapd 
and email/page when the process hang?

your help is greatly appreciated. 

thank you very much

regards


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