I just purchased the GLSF1200 ac1200. It will not connect to internet 5ghz network, only 2.4ghz. It will eventually connect 5ghz SSID but does not connect to internet. I have upgraded firmware and rebooted.
So 2.4G connects and you have Internet?
Is this a hotel network? or your own network.
When this happends, pls try to ping 8.8.8.8 on the router and on your pc to identify which node is the problem.