Saturday, 6 July 2013

Unable to Detect Wifi Router on One Laptop While Other Laptops Can

Have you occur when you set up a new router for your needs on WiFi but you cannot use it on your laptop? The strangest part is that your laptop cannot detect your router but other devices or another laptops can.

In my case, I have 2 laptops, one is Window Vista OS and the other is Window 7 OS.

After setting up the router, my android smartphone and Window 7 laptop can detect Wifi and access internet without any problem. However, another of my Window Vista laptop, it simply cannot detect my new Wifi router. It always show there is an "Unidentified network"

Initially I thought it was the router configuration problem. But I’ve ruled out the possibility because my smartphone and Window 7 laptop can detect and use the Wifi seamlessly. I have tried to update the latest driver for Wifi but the problem persists.

With some luck, I found it was some settings on the Wifi adapter properties need to configure and the problem is solved.

1.    Start > Control Panel > Device Manager > Network adapters
2.    Look for your WiFi model
3.    Right-click. Select ‘Properties’
4.    Click on ‘Advanced’ tap
5.    Make sure the following ‘Value’ is set to ‘Auto’
    -    802.11n Channel Width for band 2.4 => switch Value ‘20MHz’ to ‘Auto’
    -    802.11n Channel Width for band 5.2 => switch Value ‘20MHz’ to ‘Auto’

The rest of the Values remain as default on the WiFi Properties on the ‘Advanced’ tap. Use them as reference for this guide. The Values may change as and when it is necessary. By default, these Values do not require to change.

    -    802.11n Mode => set Value to ‘Enabled’
    -    Ad Hoc Channel 82.11b/g => set Value to ‘11’
    -    Ad Hoc QoS mode => set Value to ‘WMM Disabled’
    -    Fat Channel Intolerant => set Value to ‘Disabled’
    -    Mixed Mode Protection => set Value to ‘CTS-to-self Enabled’
    -    Roaming Aggressiveness => set Value to ‘Medium’
    -    Transmit Power => set Value to ‘Highest’
    -    Wireless Mode => set Value to ‘6. 802.11a/b/g’

Alternative Solution:

You can also look directly into your router setting on 'Channel Width' which might be the cause of the problem. However, this setting might not apply to all routers, depending the router model and it's available functionality.