SMB signing mismatch – network share unavailable

What is SMB-SIGN-MISMATCH?

Cannot connect to a Windows file share. Error: 'The network path was not found' or 'Access denied' due to SMB signing policy conflict.

Common Causes

• Server requires SMB signing but client has it disabled
• Outdated NAS firmware with SMB1 only
• Firewall blocking port 445

Step-by-Step Fix Guide

• 1
  Enable SMB signing on client: Set-SmbClientConfiguration -RequireSecuritySignature $true
• 2
  Update NAS firmware to support SMB2/SMB3
• 3
  Allow TCP port 445 in Windows Firewall

Commands & Diagnostics