fork() failed: Resource temporarily

[Vlado Zoric]

Hi,
can someone help and tell me why I'm getting fork failed: Resource temporarily
unavailable?

I installed freebsd on new, and I upgrade my freebsd version to 5.1-rel,
configure rc.conf, syslog.conf, hosts.allow, ipfw, etc

all.log:Nov 27 05:15:40 devilz sm-mta[428]: runqueue: Skipping queue run --
fork() failed: Resource temporarily unavailable
all.log:Nov 27 05:15:41 devilz sm-msp-queue[431]: runqueue: Skipping queue run
-- fork() failed: Resource temporarily unavailable
cron:Nov 27 03:11:01 devilz /usr/sbin/cron[497]: (CRON) error (can't fork)

Regards,
    Vlado Zoric

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