Airport extreme will reconnect not extended wireless network

The power to my Airport Express (2nd version; 802.11n) has been inadvertently disconnected and it does not now restore for extended wireless network.  I have an Airport Extreme (802.11ac) that hosts the network.  I have soft, hard, and factory resets to the Express.  Airport utility says that an "unexpected error occurred, try again."  I have, over and over again.  Airport utility finds the Express after a reset.  After initial connect failure, I brought the two devices in the same room.  Should I reset the extreme as well and start over?  V10.11.3 OS X, v. 6.3.6 Airport utility.  Thanks for your help.

At this point, I would say that you make the Express in the same room as the extreme. Go ahead and perform a reset on the only default Express. Wait for it to finish.

You should now be able to 'see' the Express in the list menu drop-down airport the two OS X menu bar and on your Mac AirPort Utility. In the menu bar is should appear as something like Apple network NNNNNN. It should appear as a Terminal AirPort Express, AirPort Utility.

If you get the message "unexpected error", check the following on your Mac:

  • Make sure that IPv6 is configured for: link-local only. You can find this setting in system preferences > network > advanced > Ethernet or Wi - Fi (according to your Mac is connected to the network) > configure IPv6
  • If your Mac is connected to the extreme by Ethernet, activate the Wi - Fi connector in system preferences > network

Tags: Wireless

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