Replace DNS with IP to make xinetd work more realiable

checkmk/debian/check_mk

@@ -7,7 +7,7 @@ service check_mk
 	wait		= no
 	user		= root
 	server		= /usr/bin/check_mk_agent
-	only_from	= nagios.it.hs-hannover.de
+	only_from	= 141.71.3.61
 	disable		= no
 }