Lookup for "501 4.7.0"
Temporary Error - This status code indicates a transient issue and may resolve itself.
Basic Status Code Details (501)
Syntax error in parameters or arguments
Enhanced Status Code Details (4.7.0)
Other or undefined security status
Something related to security caused the message to be returned, and the problem cannot be well expressed with any of the other provided detail codes. This status code may also be used when the condition cannot be further described because of security policies in force.