apache-2.2.15 on mac os x snow leopard: could not lookup DNS configurationinfo service: (ipc/send) i

dear community,

httpd behaves pretty strange on my mac installation: i am serving a cgi
script and everything works ok after starting the httpd (e.g. from the
access_log):

xx.xx.xx.xx - - [25/Mar/2010:18:15:50 +0100] "GET /cgi-bin/run.py
HTTP/1.1" 200 29 "-" "Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.6;
en-US; rv:1.9.2.2) Gecko/20100316 Firefox/3.6.2"

great!
but then, some time later, the cgi script is no longer available,
instead i find this in the error_log:

[Thu Mar 25 18:02:44 2010] [error] [client xx.xx.xx.xx] could not lookup
DNS configuration info service: (ipc/send) invalid destination port

a restart of the server fixes this, but only for a short while.

could somebody guess what causes this?
help would be greatly appreciated. TIA, chris.



here some things i tried for diagnosing this issue:

*508 moria ~ $ hostname
*moria.local.pc

*509 moria ~ $ ping localhost*
PING localhost (127.0.0.1): 56 data bytes
64 bytes from 127.0.0.1: icmp_seq=0 ttl=64 time=0.039 ms

*512 moria ~ $ sudo apachectl -S*
[Thu Mar 25 18:16:31 2010] [warn] module php5_module is already loaded,
skipping
httpd: Could not reliably determine the server's fully qualified domain
name, using moria.local.pc for ServerName
VirtualHost configuration:
192.168.1.222:80 is a NameVirtualHost
default server 192.168.1.222
(/tools/apache-2.2.15/conf/extra/httpd-vhosts.conf:27)
port 80 namevhost 192.168.1.222
(/tools/apache-2.2.15/conf/extra/httpd-vhosts.conf:27)
port 80 namevhost www.xxx.de
(/tools/apache-2.2.15/conf/extra/httpd-vhosts.conf:43)
port 80 namevhost www.xxx.net
(/tools/apache-2.2.15/conf/extra/httpd-vhosts.conf:61)
Syntax OK

My setup:
http: apache-2.2.15, vhost configured (see above)
platform: mac mini
os: OS X, Darwin moria.local.pc 10.2.0 Darwin Kernel Version 10.2.0: Tue
Nov 3 23:08:29 PST 2009; root:xnu-1486.2.11~3/RELEASE_I386 i386




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