So I went on a trip and decided to play some Portal 2 SP in the car. Steam warns me it's going to be in Offline mode. Okay, I understand. So it's days later and my pal wants to do some P2 Co-Op. I try to launch Steam but I keep getting this message. I've tried connecting Hardwire to my modem and being on a different WiFi network but nothing is working? Do I have to just remove and reinstall steam at this point?