A very good guide on how to configure your Aerohive wireless network to use RADIUS authentication to authenticate users against a Windows Active Directory, and setting network access (VLAN) based on their group membership:

http://boundless.aerohive.com/blog/how-to-configure-microsoft-nps-to-pass-user-profile-attributes-to-an-aerohive-ap.html

Found this very handy WEP key convertor online (HEX to ASCII and back):

http://www.dirtymonday.net/key_convert.html

If your Samsung Galaxy S5 may not find or be able to connect to a specific 5Ghz wireless network, you may want to check which channel the network is operating on. The S5 has problems when trying to connect to DFS-channels (Dynamic Frequency Selection).

DFS-channels are basically every channel from channel 52 and up. Try setting your AP to a channel between 36-48 (inc.), and then try reconnecting your S5.

A very interesting read about Wi-Fi implementations and its pitfalls in larger deployments, in particular about the usage of channels and the importance of channel plans.

http://blogs.aerohive.com/blog/the-wireless-lan-training-blog/wifi-back-to-basics-24-ghz-channel-planning