If the network has a firewall enabled you may need to enable the gateway to access the remote hosts it needs. The list of services is provided below:

HOST

PROTOCOL / SERVICE

PORTS

api.parklio.com

TCP / HTTPS

443, 80

www.google.com

TCP / HTTPS

443, 80

connectivitycheck.gstatic.com

TCP / HTTPS

443, 80

time.android.com

UDP / NTP

123