There's a new version of War2Observe that fixes the crash issue, download from the downloads page today!
Check your registry file. Follow the Lan tutorial sticky above us. See what the game data port is set too.
fuck still can't host
when i was hosting games for awhile some bot/server thingy was whispering me saying i needed port 3493890 open (some random number). you didn't get any notification of what port it wanted you to open?