Customers who upgrade to Mobile Connect 5.0.0 may encounter a connection error when connecting from an IPv6-only network. To confirm your device is using an IPv6 address open the Mobile Connect app and navigate to Settings | Device Information.
Steps to reproduce:
Upgrade the IOS to 11.0.3 and MC to 5.0.0.
Configure the profile in the MC.
Try to connect. It stays in "connecting" status.
After sometime it disconnects.
This issue is currently scheduled to be fixed in an upcoming release of Mobile Connect; version 5.0.2.
In the mean time a workaround exists. Access the server by a hostname, rather than by raw IPv4 address. This will require one of the following.
Option 1: Set up a DNS record for the hostname. The record can be an IPv4 record (A), or an IPv6 record (AAAA) if the server also has a native IPv6 address.
Option 2: Use a hostname of "<IP address>.xip.io". Xip.io is a free service which is not operated by SonicWall; please see http://xip.io/ for more info on that service.