New users cannot access domain over wireless connection

Hello,

I have a couple of Windows 7 laptops that are used over a wireless connection in an office. The problem is that every time a new user tries to login, it gives the 'no domain available' message. In order to get the users in, we have to connect the computer with an Ethernet cord but that is not feasible all the time. The DC is Windows 2012 and the laptops were upgraded from XP(not sure if this matter).
Alan DalaITAsked:
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Joshua GrantomSenior Systems AdministratorCommented:
this is happening because

1. ) Your wireless does not have its DNS servers set to a DC of the domain

or

2.) The laptops are not automatically connecting to the wireless network when they are powered on. Depending on hardware, you may not be able to change this. Usually, a user must be logged on in order to initiate a wireless connection.

Once a user has logged in, their credentials are cached for a certain amount of time, this allows them to log into the laptop even if it is not connected to any network.
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