The client received an unencrypted message when encryption was expected. Server name: %6 Session ID:%3 Tree ID:%4 Message ...

The client received an unencrypted message when encryption was expected.

Server name: %6
Session ID:%3
Tree ID:%4
Message ID:%2
Command: %1

Guidance:
This error indicates that SMB messages are being modified in transit across the network from the server to the client. This may be due to the session ending on the server, a problem with the network, a problem with a third-party SMB server, or a "man-in-the-middle" compromise attempt.