A Dell notebook with Intel AC 8265 can connect to a new hAP ac3 only if I disable the 802.11ac in the Windows driver settings of the WiFi adapter.
Can you give me any directions how to debug this issue?
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I just replaced an existing $15 TP-Link router with a hAP ac³ device. I've used the the Quick Set -> Home AP Dual configuration. Immediately after launching it I've found a Dell Laptop with Intel AC 8265 WiFi adapter being unable to connect to the network (same SSID and password). After an hour of tests I found out that the laptop cannot connect to the 5GHz interface. If I disable the 5GHz interface, then the laptop connects immediately to the 2.4GHz interface in a second.
At first I thought it is the laptop and the WiFi adapter or the driver. So I've updated the driver of the WiFI adapter to the latest possible version from 2012. This didn't solve the problem. After playing enough with the settings of the adapter provided, I've found an option that I can switch so that the adapter works on 802.11n and not on 802.11ac. Putting the adapter to work on 802.11n seems to solve the problem. I thought that the issue is with the laptop, the driver or the WiFI adapter.
But few hours later another laptop arrived at the office (Asus) and started acting the same way - the laptop is unable to connect to the 5GHz network. This time I completely disabled the 5GHz interface until I solve the issue. After disabling the 5GHz the Asus computer also managed to connect to the network (obviously using 2.4GHz).
I have no idea hot to debug this issue. But it seems there is something wrong in the router or the configuraiton.
Can you give me any directions or hints on how to understand the reason of the problem?