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jazzyhacker's avatar
jazzyhacker
Copper Contributor
Jul 24, 2023

Copy-Item Returns IO Exception Invalid Signature From MacOS SMB

Hi,

 

Currently I'm trying to backup a folder on my MacOS (Mac Mini) to Windows Server. In the middle of the Copy-Item command, process terminated and return error IOException: Invalid Signature.

 

How can I fix this? Please be kindly advise.

 

Thanks in advance.

Windows PowerShell
Windows Server
  • LainRobertson's avatar
    LainRobertson
    Silver Contributor
    Jul 24, 2023

    jazzyhacker 

     

    This isn't a PowerShell error.

     

    This is an issue with the MacOS configuration (Linux/SAMBA? - I can't remember) as discussed here:

     

     

    The proper resolution is to get the MacOS client to supply a signature.

     

    The wildly inappropriate resolution (but obviously still technically possible) is to configured each Windows SMB3-capable machine (be it server or client) to which files may be copied, to disable secure negotiation.

     

    Cheers,

    Lain

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