Hey there. I was having a problem with my computer restarting so I decided to do a fresh OS install on my 2012 MBP. I was using Yosemite and reinstalled that at first then I installed El Capitan. This issue happened on the fresh install of both Yosemite and El Capitan. As soon as it started up I get that annoying "networksetup is trying to modify the system network configuration" dialog box. I enter my password but the same thing pops back up immediately. No matter how many times I enter my password or hit cancel it pops back up. It even took over letting me type in anything in any program or terminal. Finally I got terminal working and verified permissions and found that there was a ton of things that were wrong so I fixed the permissions and still no luck. I am kind of new to Mac so if you can help me that would be greatly appreciated.