This probably won't affect a lot of people but if you happen to be someone that restricts outgoing traffic on your network be sure to have the following open for the Stadium during the initial setup of the device
TCP 443
ICMP (ping) to 1.1.1.1 and 8.8.8.8. (Google DNS)
TCP/UDP 53 (DNS)
UDP 123 (NTP) - this is may be optional.
The first three are required (I'm not sure if NTP is, but it does make an NTP query) otherwise the helix will not allow you to l