Hi I am running a cable modem to a Linksys 150 WRTn. I have that connected to my Airport Extreme via ethernet. I am used the set up feature in the airport utility and chose the bridge option. It works awesome for a few days then the airport extreme will not allow any computer in the house to connect and it gives the same message "you need a WPA password" weird part is I have a WPA password. Last time this happened I had to discount the extreme set it up again as a standalone wireless device, then re hook it up as per the above and it worked for a week. Now it is reporting the same error.