Network access to guest blocked when display is sleeping

[Chuck Steel]

I'm running OS 10.9.1 (Mavericks) with VB 4.3.6 and have discovered that when my display is either sleeping or the screensaver is on I lose network access to my Windows guest machine. I can verify this by putting my display to sleep and running a ping from another system and after about 30 seconds the pings no longer reply. I cannot access the computer remotely at all. Once I wake up the screen pings reply and I can access the machine remotely. I have seen the issue with both Windows 7 and Windows 8 guests. The guests are configured for bridged networking but I believe the same issue is seen if I switch to NAT. Has anyone seen anything similar to this?

[rpmurray]

Have you checked the Energy Saver settings to make sure that you're not putting the hard drive(s) to sleep also?

[Chuck Steel]

Yes, the drives are not set to go to sleep.

[Chuck Steel]

In case anyone else has this problem and stumbles across this post, the issue was being caused by the App Nap feature:
http://reviews.cnet.com/8301-13727_7-57 ... mavericks/