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