MAC book access to AD

One of a MAC book can't login to the AD. Try to compare the setting with an option that works and I find that a option "Allow network users to log in at login window". Both version is Yosemite 10.10.5. Any idea ? Will that be a potential problem for not able to login ? Tks
AXISHKAsked:
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serialbandCommented:
It may have lost its binding.  Unbind the domain and rejoin.
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AXISHKAuthor Commented:
Tks, It works and how does the binding doesn't work accidentally ? I have notified that that a setting in Login Option "Allow network users to login at login window" is missing in the problematic MacBook. Delete unbind and remove the computer name in AD, this setting reappear again.

I was told that this setting is missing if the network connection is poor. Is that true and it
is caused by other reason.
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serialbandCommented:
Macs have issues.  They will lose binding.  It may be because they are remote laptops.
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AXISHKAuthor Commented:
So, can't find it permanently ? Tks
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serialbandCommented:
If you take it away from the AD, it will occasionally lose partial binding on the Mac side, but it will still show as bound to AD.  I've seen it happen too often when remote users need to change their passwords and they get access denied.  It's still mostly bound to AD and has access to file shares, but it loses access to change passwords until you rejoin it to AD.

The other thing with remote Mac systems on AD is that you need to make sure you enable Create Mobile Account at login.  Otherwise AD accounts will always need to be connected to the network to log in.  It basically caches login credentials on the Mac.
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AXISHKAuthor Commented:
Tks
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