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Invalid file handle error

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I am getting a Invalid File handle error when trying to connect to my QNAP NAS.  The Event code is 0x00040025+0x0000FFF0+0x80070544

 

When I "Edit connection settings" I can successfully test connection , receiving a tick and Connection Established.
However when I then press the Connect button I get the "Invalid file handle " error.
The NAS & Acronis has been running successfully for a number of years.  
I am currently running Acronis Cyber Protect Build 40729 on Windows 11 pro.
The QNAP nas is running 4.3.6.2441 , a very recent OS version.  The NAS functions normally when accessed from windows 11 via a file share.

Any ideas what is going wrong and how to fit the problem ?

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