I was trying this out during the free weekend on Steam and I'm glad I didn't buy it. I went to Multiplayer, then switched to Blitz mode because I want to learn the game before going up against real players. It seems like I have about a 50% chance of the Blitz server list working. If it doesn't work, then even the Crossfire servers fail to appear on the list when I hit refresh again. I have to exit the game completely to try again. I have forwarded the ports listed here and disabled my firewall. I know that was for dedicated servers, but I figured I would try since I couldn't find the specific ports the client uses. It is sad when the multiplayer part of a multiplayer-focused game doesn't work right. I doubt this will be fixed before the free time on Steam is up, so I won't be able to re-evaluate my decision to not purchase this. Honestly, I would buy it if this one issue wasn't preventing me from playing.