Why can't I select preferred wifi networks

why can't I select preferred wifi networks

I don't know how to block the other wireless access points to show on the list, but from what you said, you want to let it connect to one of your preferred network whenever one is available, connect it automatically.
before you change anything, let run the following command in Terminal to show your Mac current settings:
/System/Library/PrivateFrameworks/Apple80211.framework/Versions/A/Resources/airp ort en1 prefs
copy what it returned.
mine returned:
AirPort preferences for en1:
DisconnectOnLogout=NO
JoinMode=Preferred
JoinModeFallback=Prompt
RememberRecentNetworks=YES
RequireAdminIBSS=NO
RequireAdminNetworkChange=YES
RequireAdminPowerToggle=YES
WoWEnabled=NO
That's the default behaviour of OS X, we don't care for what reason it was changed on your Mac. Lets reset it.
in Terminal, run the following command:
sudo /System/Library/PrivateFrameworks/Apple80211.framework/Versions/A/Resources/air port en1 prefs JoinMode=Preferred JoinModeFallback=Prompt RememberRecentNetworks=YES
it may ask you to put admin password, and do so, press enter to continue.
Explain a little bit.
The JoinMode=Preferred means, it will connect your preferred network when it's available.
JoinModeFallback=Prompt: if no preferred network around, it will prompt you to choose. if you want you can select other options:
     JoinOpen
     KeepLooking
     DoNothing
RememberRecentNetworks=YES: it will remember whatever network it joined before, put it in your preferred network. If you want, set it to No.
you can get the details of airport command by run:
/System/Library/PrivateFrameworks/Apple80211.framework/Versions/A/Resources/airp ort
Hope this help.

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