"Message signing enabled but not required" with Samba

Solution Verified - Updated -

Issue

  • SMB2 packet signing is not enforced when "server signing = required" is set.
  • While server signing and client signing is configured in Samba, a nmap script (smb2-security-mode.nse) is returning Message signing enabled but not required.

Environment

  • Red Hat Enterprise Linux 8
  • Red Hat Enterprise Linux 9
  • samba-4.17

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