Seagate wireless plus cannot see my airport network
I've just bought a Seagate Wireless Plus external drive, but for some reason it won't detect my home network, which is established using an Airport Extreme (bought in 2012).
It can see my ADSL-routers standard wireless network, which I don't use, but not any of the Airport networks (2.4 GHz, 5.0 GHz, and Guest network).
I've tried manually entering the SSID and WPA/WPA2 passcode, but it won't connect.
Does anybody have an idea of what the problem could be?
Regards,
Sune
AirPort Extreme 802.11n (4th Gen), OS X Mountain Lion (10.8.5)