iMac connects to the router of Linkysys WRT1900ac

I am trying to help a friend get his iMac 12.1, that is running 10.11.4, to connect to a new Linksys WRT1900ac router.  The router is a novelty in this House, is in the same room of 10 x 12, as the computers listed below, and the installer was using the Linksys recommends the method, which is to let the Linksys to make adjustments.

Here are its configuration;

The router is connected to a cable modem, ISP and the following devices are connected to the router and works well;

Via ethernet

Windows 10 PC

AT & T cell phone extender

Ooma VOIP

Wireless

iPhone

iPad

Notebook PC

While troubleshooting my MacBook 5.1 also allows to connect without problems to the Linksys router.

Note that her iMac connects without problem to the wifi network Netgear Guest unprotected from its neighbor.  I also installed in his room my 1st generation Airport Express, which has added a second wifi network but without access to the internet and his iMac connect without problems to this wifi.

Here are the steps I took to try to solve this problem, and they were unsuccessful;

➔ Scanned for malware/adware with Malwarebytes and found nothing.

➔ Ransacked after the files in/Library/Preferences/SystemConfiguration and restarted

com Apple.Airport.Preferences.plist
NetworkInterfaces.plist
Preferences.plist

➔ When the previous did not work I trashed all the files in the folder/Library/Preferences/SystemConfiguration except "com.apple.boot.plist', which would not remove and rebooted

➔ Created a second user account and still not able to connect to the Linksys router

➔ Repaired permissions

➔ Created a new location in System Preferences > network and added the OpenDNS addresses and in the material value MTU 1453

➔ restarted in safe mode and not still could not connect

Firmware on the router Checked ➔, which is updated

➔ Reset SMC

➔ reinstalled El Capitan via the App Store

That's all I could think about.  I'm puzzled.

I checked the router and everything seems ok, but I'm no expert.  There may be something I'm not contagious.  I have seen that he has no MAC filtering set up in the router, so this isn't everything.

Please tell me if there is something that I'm on.  Is there something in the router, that I need to change?  There are other files in the Mac, I need to delete?  Is there any other troubleshooting steps I can take to identify this problem.

Any help would be appreciated as it is a total mystery to me.

There are a lot of variables, but start with some basic info. So on her iMac, if you click the wifi at the top right, you can see his router listed?

Tags: Mac

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