The setting Microsoft network client: Digitally sign communications (always) must be configured to Enabled.
The server message block (SMB) protocol provides the basis for many network operations. Digitally signed SMB packets aid in preventing man-in-the-middle attacks. If this policy is enabled, the SMB client will only communicate with an SMB server that performs SMB packet signing.
Satisfies: SRG-OS-000423-GPOS-00187, SRG-OS-000424-GPOS-00188
Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> Security Options >> "Microsoft network client: Digitally sign communications (always)" to "Enabled".