Hi
One more tidbit of data to add to the puzzle (happened once just now, going to try to reproduce it to be sure) -
State:
No communication allowed (DNS or AD) to server C
Only DNS/53 allowed to servers A,B
1) Response time slowed down as before
2) We restarted apache
3) response times returned to normal on restart
On the surface it seems like apache must be hanging on to something, but will try to see if I can get an strace and look for any more clues.