We are having some problems with Plesk on Virtuozzo.
Red Hat 5 64
Virtuozzo 3.0 sp1
Red Hat 4 64
Every 15-30 minutes or so I get a dns error when surfing either the control panel or a website running from the plesk box. I can't seem to see any traces to what would cause this in the logs. During this 20 second or so "outage" I am still able to ping the machine and remain SSH connected to the VE. Basically I cann't load an web page or refresh the current page for about 20 seconds or so then all seems normal after that. No logged events, system does not reboot, apache does not go down.
Plesk runs its own Apache build independant of the ones serving domains under plesk, so I can't believe it is an apache problem.