55016: Acronis Cyber Files: Connection from a mobile client fails with "Invalid Signature (2148073478)"

Also read in:

use Google Translate

Applies to: 

Last update: 05-06-2020


A mobile client is unable to connect to a share. Connections fails with an error like:

Error enumerating folder 'Operations iPad Share' from server 'Files Advanced File Server': Invalid Signature. (2148073478)


Windows Server 2012 SMB 3 Secure Negotiation may not allow connections to remote share.


Disable Secure Negotiate in the Windows Server OS on the Files Advanced server.

  1. Open Windows registry: Start -> Run -> regedit.exe
  2. Navigate to HKLM:\SYSTEM\CurrentControlSet\Services\LanmanWorkstation\Parameters\
  3. Set RequireSecureNegotiate to 0.
  4. Reboot