There is a known issue where the CentreStack Server Agent disables the SMB2 protocol on the file server it is installed on. This was done intentionally because the published CIFS share feature is currently incompatible with the SMB2 protocol. When the SMB2 protocol is disabled, Windows clients attempting to connect to a CIFS share may display this error:
The mapped network drive could not be created because the following error has occurred:
You can't connect to the file share because it's not secure.
This share requires the obsolete SMB1 protocol,
which is unsafe and could expose your system to attack.
Your system requires SMB2 or higher.
To resolve this problem, please remove the following value from the Windows registry and then reboot: