This problem just started happening on my rMBP late 2013 (mavericks) this morning. I can't connect to any secured wifi networks, I just get a "connection timeout" error at the bottom of the password window. I have been able to connect to public networks fine, so presume is a software/driver problem. Has anyone else started experiencing this recently. Worked fine on secured networks last week, and as far as I am aware, there were no network driver updates on my machine. Thanks.