I have been putting up with this mildly annoying error message for a couple of months now. “wide” is my own router which has no issues working with my iPad, iPhone, other laptops, apple tv, and everything else. But whenever I connect my iMac, I get this error. In the beginning, I could just select the network again from the menu on the menu bar. But now that simply causes another failure.
My initial investigations had led me to believe that it could be fixed by fixing an entry in the KeyChain Access application. But that solution did not resolve the issue permanently. It came back very soon. And apparently thousands of people are having this issue – probably due to an unchecked regression in Apple’s code. While the annoyance continues, I have found a quick fix that, though temporary, is a viable and reliable workaround.
I go to the network icon on the menu bar, and choose a neighbor’s locked wireless.
Note you can either click on “Join Other Network” or just pick one from the list. Then when that router asks for a password, I enter a few letters till the “Join” button lights up.
I hit enter. The router refuses the connection because the password is obviously wrong. Now I just select “wide”, my network, from the list and it connects like a charm.
Problem not solved, but quick workaround for mild annoyance, which hopefully Apple will fix soon.