"Key not valid for use in specified state" (DPAPI) error when access from different machine

Asked Oct 26 '17 at 21:23

Active Jan 23 '18 at 07:25

Viewed 666 times

We use Cryptography.ProtectedData.protect and Cryptography.ProtectedData.Unprotect for Encryption. The scope is DataProtectionScope.LocalMachine.

The application is hosted on a shared drive. When a user access the application from their own computer it will encrypt a config file which works for this user from this point. However thereafter if any other user access the application from their own computer on this shared drive the receive the error: Key not valid for use in specified state

It seems that when you access the application remotely from A computer it acts that local machine is A computer not the machine where the application is hosted.

Thanks for any info

asked Oct 26 '17 at 21:23

John Sheridan

That's the way DPAPI works, you either choose by Machine or by User - are these two users using the same machine? – Jeremy Thompson Oct 26 '17 at 21:28
Thanks no they access the application from different machines via accessing a shared folder – John Sheridan Oct 26 '17 at 22:12

"Key not valid for use in specified state" (DPAPI) error when access from different machine

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