Can't Connect MacBook and MacBook Pro at same time to AEBS

I can't connect a MacBook and MacBook Pro to an Airport Extreme Base Station at the same time. Whichever one connects first works and the other one doesn't. It was working fine for months and then stopped working. Can only use one computer at at time. There's nothing else on the network. It may have been a software update that caused the problem, but I'm not sure which one. Have done all software updates and am not using any security on the network, so that's not the problem. Many sleepless nights trying to get this fixed, so any help would be greatly appreciated!

bcassid
Do me a favor. So many users are experiencing this (no myself though) and I have suggested so many things with nothing constantly working. There are successes here and there, but nothing consistently solves the problem. However, try the following in Airport Utility and both Macs, and then let us know what happens.
*Can’t Access Certain Web Sites / DNS Server Settings Issues*
I'm wondering if either or both Airport Utility & Network Prefs have proper DNS server settings. Try this
Launch Airport Utility.
Select TC on left.
Click "Manual Setup".
Select "Internet" from the toolbar above.
What's listed for "DNS Server(s):"?
Try putting in these servers from OpenDNS
208.67.222.222
208.67.220.220
Click "Update".
Your TC will restart with the new settings.
Next, launch System Prefs --> Network Prefs.
Select the service you usually connect with on the left (Airport or Ethernet).
Then click, "Advance..."
Click the "DNS" tab.
What's listed for "DNS Server(s):"?
Usually "10.0.1.1" will be listed first in gray. This refers back to the settings in the Airport Utility.
Nevertheless, it doesn't hurt to add the DNS servers noted above here as well.
Click "OK" then click "Apply".
Finally, reboot your Mac.
Now see if you have internet access all around.
Let us know if this resolves your issue.
Cheers!

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