If you can't mount SMB share hosted by a Mac bound to Open Directory — by Apple Support

advancedpageLink only (©)

Explains that SMB 3 sessions are signed in macOS unless guest or anonymous, and that a client can set validate_neg_off=yes in /etc/nsmb.conf. Apple warns this raises man-in-the-middle exposure, so use only on secured networks.

Quick steps

Edit /etc/nsmb.conf: [default] validate_neg_off=yes

Paraphrased from the source. Menus can differ by version, so check the original for full details.

Read the full article on support.apple.com

Source: If you can't mount SMB share hosted by a Mac bound to Open Directory by Apple Support. Licence: Link only (©).

Source reviewed: 2026-11-02
Link checked: 2026-11-02
Tested hands-on: Not by Oddbyte.Me

smbsigningnsmb.confopen directory

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