If you are having issues setting up or connecting to a VPN (Virtual Private Network) we would suggest the following:
Android 4.0 and up:
If the default version is IPv4, try changing it to IPv6.
Apple iOS 10 and up:
We recommend if the default 'type' is IKEv2, test it out with IPSec or L2TP.
Apple iOS 9 and earlier:
In earlier versions of iOS, VPNs default to running a PPTP connection which is not a secure connection, so try connecting through L2TP/IPSec - IKEv2/IPSec - Cisco IPSec.