Okay, so I have a WiFi network in my apartment, with WEP Password encryption. I have a Mac Pro and a PowerBook connected to it successfully, no problems. My friend is trying to connect his MacBook Pro, and it refuses to connect. He came over here before and connected to it when it was on WPA mode, but I changed the security setting since then. So I deleted the keychain entry for my network, I even deleted his Airport preferences and rebooted, but all to no avail. Where my Mac Pro connects instantly, the MacBook times out and then gives the unhelpful, non-descript error "There was an error joining the AirPort network [name]." Clicking Try Again just nets the same error after a few seconds. Any ideas? Just checked system.log in the Console and found this line: Code: Feb 17 21:53:00 rian-kountzs-computer /System/Library/PrivateFrameworks/ Apple80211.framework/Resources/airport: "Midgard" has weaker security than Airport was configured for this network (2 vs. 255). Not joining for security reasons. I'm guessing that has to do with me changing the network from WPA to WEP. But wouldn't deleting the preferences help with this? Are there some other prefs I could kill? Why would my Mac Pro accept the change fine and his MBP wouldn't?