Network Manager won't forget bad wep key

["John L. Cunningham" <djohngo@gmail.com>]

How do I get Network Manager to prompt me for a wep key again? I accidentally
typed in the wrong wep key, and now it just says:

Connection Failed Activation of Network Failed

whenever I try to connect.

I have told it to "forget network" once, in the hopes that it would try
to get the credentials again, but it didn't work.  

I tried grepping .gconf to find the xml file that has the bad wep key,
but that didn't work either.

I'm running Gnome on Debian Wheezy.