grimstad wrote:
My Airport Extreme is working just fine, but I want to add Airport Express. The first step in my manual says to open Airport Utility, but I get the message "Airport Utility was unable to find and AirPort wireless devices.
This may happen if your system accidentally switch the radio band.
Try this first:
Disable WiFi in the Menu Bar
Enable again
Check if the Airport Extreme shows up in Airport Utility
If so, choose the Airport Extreme
Click Manual Setup
On there:
If possible disable "Guest Network" (it cause trouble by switching constantly radio band for user convenience)
Give the 5GHz wireless a dedicated name
If you have no 802.11g (iPhone, iPod Touch) in the network:
Set radio mode to: 802.11n only (5GHz) - 802.11.n only (2.4GHz)
If you need 802.11g
Set radio mode to: 802.11n only (5GHz) - 802.11b/g
You will reach these settings by holding option key (alt) while clicking on the Radio Mode pulldown.
Click Apply and wait for the Extreme to come back
After that,
check that your 5GHz capable systems use only the 5GHz name (SSID) when joining wireless.
For that, delete the 2.4GHz name (SSID) from the list of known networks in Systems Settings - WiFi - Advanced
Move the preferd network in the List at first place.
Rejoin wireless
Lupunus
PS ... to configure the Express, best connect a laptop via Ethernet to them. This eases the process a lot.