As times change, so do versions of iOS and macOS. With this latest round of changes from Apple, are a few security changes that can cause some headaches if you are planning on using either iOS 11 or macOS X 10.13 to connect with GlobalProtect.
I wanted to point out some of the items that are listed to change:
Removes support for TLS connections using SHA-1 certificates. Administrators of TLS services should update their services to useSHA-2 certificates.