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# Error: “The Caller is Unauthorized.”

Intel AMT includes a security mechanism to prevent brute force attacks that are trying to “crack” the Digest admin password. If a brute force attack is detected, connection to the device is blocked and error messages like these are recorded in the log file:

Intel(R) AMT connection error 0xc000521d: The caller is unauthorized.

After connection to the device is blocked, this error will continue to occur even when trying to connect with the correct password.

Solution:

Wait for approximately one hour and then try the requested operation again.