This feature is not supported on firewalls. You can configure this feature only on an SMA appliance.
To enable the TLS 1.3 support
On the SMA 100 appliance, navigate to System > Administration,and the Administrator can select TLS1.3 under the Global SSL/TLS Settings section.
The user can install NetExtender 10.3 on both Windows and Linux with ARM64 processor.
The user uses all the NetExtender features.