Asus PCI WiFi Card and Router don't connect at 5ghz

GregP74

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Jul 25, 2016
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I recently picked up an Asus model RT-AC1900P router and an Asus PCE-AC68 PCI Express card. The router's running the latest 3.0.0._380_3831 firmware. Card is using the 7.35.315.0 driver for 64bit Windows 10.

The router has been great. It hooks up just fine both with wired and wirelss connections to our smart tv, Roku box, 3 iPhones, iPad, and laptops both on 2.4ghz and 5ghz bands.

The only device I'm having issues with is the one I least expected -- the Asus PCI card in the desktop computer 40 feet away.

On that machine, 2.4ghz connections work every time, solid as can be. 5ghz not so much. Both networks show strength as just fine. Sometimes the 5ghz network will connect with no problems as soon as the computer boots. Other times it sits there with a * on the network connection icon but looks like it hasn't attempted to connect, even though the "connect automatically" item is checked. Other times it tries to connect but I get a message about "Secured, No Internet" or "Checking network requirements" and it tells me unable to connect with this network.

This is turning out to be a real head scratcher for me as everything else works fine. I don't see any rhyme no reason to when it happens. No appliances being used, no neighborhood WiFi networks seem to be conflicting.
 


Antenna doesn't seem to affect anything. I've tried them in different positions on the back of the PC as well as with the extension cord and base.

Driver is the 2nd latest, for non-EU
 


That's the thing that's been making me crazy it's not that far and it looks like the signal strength is way up there. Showing as very strong.
 
Like I said this desktop isn't all that far from the router. There's a drywall wall but that's about it. Windows shows it as having 5 bars of signal strength. Perhaps something else is interfering at times.

And the frustrating thing is it's random. It connects to the router just fine sometimes then other times it's a no go.