Requires a current support contract. Open a support case and ask support for the Small Update patch
Current revision: up30r2 with Samba version update which will include the 90929 SMB SU (small update):
- new options in Text User Interface (TUI):
a) SMB1 off - this option (enabled by default) turns off SMB1.
b) fix for CVE-2016-2114 (server signing). It is disabled by default. By enabling, the SMB connections are forced to be signed. When disabled, signing depends on the client.
c) symlink support - this option enables support for symbolic links. It is disabled by default.
Those options can be found under Console tools (hotkey: ctrl-alt-T) > Addons > Samba special features. You are allowed to enable/disable them as you wish.
WARNING: enabling and disabling those options will trigger an automatic SMB service restart!