Wifi on iPhone but not not laptop or range extender

[collectionbin]

All of a sudden our wifi started acting up.  I can access the internet with my desktop via ethernet cable (no wifi card on desktop) through the router and on wifi with my iPhone.  I cannot access the internet with my laptop's wifi nor my father-in-law's laptop, and the wifi range extender no longer picks up the wifi signal either.  What has happened?  I have turned the router off and back on and I have hit the factory reset button.  Our ISP says it isn't anything on their end; it is definitely the router.  Any suggestions?

[collectionbin · Accepted solution]

Brother in law reset the router, and now it works. Never mind the fact that I reset it 2 times myself. Unbelievable.

[michaelkenward]

Can you use the LAN connection (see below) to get into the device's web interface and check the wifi settings?

http://www.routerlogin.com/

or

http://www.routerlogin.net

[collectionbin]

I can do that. What do I need to check?

[michaelkenward]

The wifi settings.

Start on page 107 of the manual:

Wireless Connectivity

WNDR3400v2 | Product | Support | NETGEAR

[collectionbin]

The 2.4 Ghz band is the one that isn't working properly. If it matters, when we disable security it works.  Once we enable the password, it doesn't allow access.  The 5-G works, but the laptops and range extender don't recognize 5G.

[collectionbin]

Also, the firmware is  the most recent one: 100521081.  Could it be a bad update?

[collectionbin · Accepted solution]

Brother in law reset the router, and now it works. Never mind the fact that I reset it 2 times myself. Unbelievable.

[michaelkenward]

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@collectionbin wrote:

Also, the firmware is  the most recent one: 100521081. 

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That is not Netgear firmware that I recognise.

The latest for you is probably: Firmware Version 1.0.0.38

WNDR3400v2 | Product | Support | NETGEAR

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@collectionbin wrote:
Brother in law reset the router, and now it works. Never mind the fact that I reset it 2 times myself. Unbelievable.

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The next round is on you.