Is there a way to lock my screen but not sleep my network connection? I step away from desk quite a bit and I lock the screen pretty much every time. When I come back I always from stepping away for like 5 minutes it seems like my machine has to reacquire an IP. This via ethernet. This is on a 2010 13' unibody macbook pro running Lion.
User Geraard's answer in this forum posting might help. The suggested settings changes seems to have fixed his problem:
Apple support seems to concur:
With luck, this setting change will solve your problem.
If your MacBook is plugged in I would try the following.
Now see if activating the Screen Saver causes you to loose your assigned IP.
The alternate method is to manually assign an IP to your MacBook while you're at work.