Downlevel clients, Macintosh clients running Mac OS 10.X attempting to connect to SMB shares, and some third party devices, such as multi-function printers/scanners, are unable to connect to the server due to SMB signing. Since not all devices are capable of working with signed SMB packets, SMB signing can be disabled on the server to allow access to these clients.
Please note that SMB signing is a security feature and that by disabling it you open the door to certain security risks. This action should be taken only when absolutely necessary.
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