I got the same problem after I installed Comodo AntiVirus today.
I know it's not Comodo Firewall becoz I have been using it with Apache without problem berfore.
I looked at my Apache error log, it's flooded with:
[error] (OS 10038)An operation was attempted on something that is not a socket. : Child 948: Encountered too many errors accepting client connections. Possible causes: dynamic address renewal, or incompatible VPN or firewall software. Try using the Win32DisableAcceptEx directive.
did some googling and found this:
http://forums.devshed.com/showthread.php?p=673813#post673813Apparently this is a bug in CAV, let's hope this would be resolved soon.