If you have a requirement for SMB Signing we do support this as a hidden feature in GuardianOS 5.2 and later.
In order to enable SMB Signing you will need to log in to the SnapServer web interface as the Snap local admin.
Next navigate to the debug page:
Enter the following command:
configini set samba signing XXX
Where XXX is one of the possible options: yes, no, auto
Auto will work in most scenarios, however occasionally you may need to set it to yes which forces SMB Signing.
You will need to restart the server for the new settings to take effect.