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My Mac Mini (2011) has always auto-joined networks fine until a few days ago when it stopped auto-joining my preferred WPA2 wifi network when I start it up. When I click Join Other Network and then Show networks my wifi appears. When I double click it I have to enter my password than my mac joins it. But the next time I start my Mac, I have to do that again.
How can I get auto-join to start working again?
Well, now I can answer my question myself.
Go to Keychain Access and remove all airport passwords for this network from Login and System keychains.
Then create a new password in System. Enter the network password. Item Name and account name: name of the network. Click add. Then double click the new item in the list. Change kind to 'airport password'. Then click Access Control and select Allow all applications to access this item.
Restart your computer. If it doesn't join automatically join it manually, next startup it will work fine again.
Go to System Preferences / Network / Wifi / Advanced and remove your network from list of Preferred Networks.
Now go to Keychain Access and remove all airport passwords for this network from Login and System keychains.
Then restart your computer, join the network, select save password and remember network.
After that, it should join automatically.
