Wi-Fi Extender "No Internet, secured".

I have a Cisco Aironet 1600 Wireless Access Point in my office connected to our network by CAT6 cable.  
I bought a Linksys RE7000 Range Extender in and attempt to boost signal in the back section of our office.  I can connect to the Cisco Aironet and it creates a 2.4G and a 5G EXT SSID, but when computers connect to the EXT options, it displays "No Internet, secured".   One user connects to it without any problem.  All other computer and phone users get "No Internet, secured".

Linksys support has not been able to help me.  Any ideas or should I return it and go with something different?
GStonerAsked:
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CompProbSolvCommented:
On a computer with the "No Internet, secured" message, do the following:
Hold down the Windows key and press the R key.
CMD
ipconfig /all
Scroll up and look for the default gateway address associated with a wireless connection.  Please post here what it is.
ping <enter the default gateway address here>
ping 4.2.2.2
ping google.com


If you'll give us the results of those three lines in addition to the  default gateway, we may well get you to a solution.
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GStonerAuthor Commented:
When connected to the extender:
The default gateway is blank.

ping 4.2.2.2
PING: transmit failed. General failure.

ping google.com
Ping request could not find host google.com  

Also the ipv4 address is not on my network.  It's displaying 169.254.145.18
It's also not displaying the DNS Servers.


When I'm connected to my primary Wi-Fi, the IP is 172.16.0.116 and Default Gateway is 172.16.0.4
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CompProbSolvCommented:
The basic problem is that when you're connected to the extender, you're not getting to the DHCP server to get a proper address.

I missed part of your initial comment.  Do these computers connect properly to the 2.4GHz WiFi but not to the 5GHz WiFi?  And there's one computer that DOES connect successfully to the 5GHz WiFi?
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GStonerAuthor Commented:
All computers connect to the 2.4 and 5GHz WiFi, just not the EXT option.   I had one computer that successfully connected to the EXT SSID yesterday, but it is no long connecting.  It's now No Internet.
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Alina BellCommented:
Only one computer getting connection secured so it is problem of nertwork service provider.
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GStonerAuthor Commented:
I reset the extender, set it up again, and now that one computer can no longer get internet access.  No one can.
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GStonerAuthor Commented:
LInksys support couldn't get it working either, so I returned the extender and replaced it with a wireless router directly connected to our LAN.

No solution - please close this question.
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Kala DreamCommented:
Go with NETGEAR Orbi it solves all the problem you are about to face . Easy as that.
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GStonerAuthor Commented:
There was no solution.  I returned the device that would not work.
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