Macbook Pro Will not Roam

User has a Macbook Pro that will only attach to a single access point in the building and will not roam from one access point to another.  There are 1700 devices that work just fine and are very mobile.  This device drops the connection and shows that WIFI is on but not connected.  Attempts to connect pops up the connection and asks for a password but will not accept it with an error invalid password.  I have tested it as well in other buildings which all use the same wireless access SSID and pw.  It will connect to the first access point it finds in the building but will not roam to another.  

I updated the OS to High Sierra to see if that would make a difference but the results have been the same.
df_tingeyAsked:
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Davis McCarnOwnerCommented:
The first thing to do on a PC or a Mac is to forget the connection and then remake it.  There are numerous hidden aspects of a network connection that are invisible, like the mac address of the router.
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df_tingeyAuthor Commented:
I have done that many times.  I have even went into the key chain and removed it from there.
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Davis McCarnOwnerCommented:
Read the second comment in this post which tells you how to set the WiFi to "strongest" which it is not by default:
https://apple.stackexchange.com/questions/66919/how-to-enable-faster-wifi-roaming-with-mac-os-x-airport-base-stations
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df_tingeyAuthor Commented:
Ok,  I was able to do that and it set it to the strongest in settings but had no affect.  It is not a matter of being slow to roam rather it will not connect to any other access point except the first one.   I set up an open ssid and pushed out to some access points and it will roam between them but when I put a WPA2/personal passphrase on the ssid it will only connect to the first access point it associates with.  When it trys to associate to the second it asks for the passphase and then gives an error that it is incorrect.    I tried creating  a separate location on settings but the results were the same.
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Davis McCarnOwnerCommented:
Apparently, OS X likes to cling to the existing WiFi until it can't and several threads suggested reducing the AP's power setting so there is less overlap.  Others said that removing all vestiges of the WiFi from both the Mac and the Router/AP's allowed a newly created joining to start working.  After that, it turned into specifics of the make and models of the APs.
Read this and if it doesn't help what are the make and model of the APs?
https://apple.stackexchange.com/questions/178985/how-to-get-osx-to-pick-the-strongest-wifi-signal-with-identical-ssids
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df_tingeyAuthor Commented:
Apple are a bit  sticky but this isn't the issue.  I have 1700 other devices apple and PC that are working just fine.
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df_tingeyAuthor Commented:
there are 100 + access points in the environment.  all from extremenetworks.  I only have the issue on one Macbook Pro.
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Davis McCarnOwnerCommented:
I don't think you had time to purge all of the DHCP leases from the APs, the routers, and the Mac; but, you may be at the point of wanting to do an image backup or to replace the storage device so you can do a completely fresh install.  An awful lot of options and preferences carry forward until the end of time.
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David AndersTechnician Commented:
Unlikely to help, but is quick and easy to do.

How to test an issue in another user account on your Mac

If an issue stops happening when you log out of your macOS user account and log in with another, the issue could be related to the files or settings in your user account.
https://support.apple.com/en-us/HT204443
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Craig BeckCommented:
If you hold the option key then click on the wireless icon in the toolbar can you tell us what the detailed connection info shows?
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df_tingeyAuthor Commented:
Last NIght I purged everything.  DNS, DHCP reset access points, controllers, switches.  This morning I was able to roam with that device.  So apparently something in the network that would not allow 1 device out of 1700 to roam.  Thanks for all of your comments.
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Davis McCarnOwnerCommented:
You need to close the question, please?
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Craig BeckCommented:
So the answer was to reboot the devices?  DNS and DHCP won't stop a client from roaming - that is a wireless function and not a L2/L3 function.
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