failure_info

        # OpenSSL::Timestamp::Response.failure_info

(from ruby core)
### Implementation from Response
---
    response.failure_info -> nil or symbol

---

In cases no timestamp token has been created, this field contains
further info about the reason why response creation failed. The method
returns either nil (the request was successful and a timestamp token was
created) or one of the following:
*   :BAD_ALG - Indicates that the timestamp server rejects the message
    imprint algorithm used in the Request
*   :BAD_REQUEST - Indicates that the timestamp server was not able to
    process the Request properly
*   :BAD_DATA_FORMAT - Indicates that the timestamp server was not able
    to parse certain data in the Request
*   :TIME_NOT_AVAILABLE - Indicates that the server could not access its
    time source
*   :UNACCEPTED_POLICY - Indicates that the requested policy identifier
    is not recognized or supported by the timestamp server
*   :UNACCEPTED_EXTENSIION - Indicates that an extension in the Request
    is not supported by the timestamp server
*   :ADD_INFO_NOT_AVAILABLE -Indicates that additional information
    requested is either not understood or currently not available
*   :SYSTEM_FAILURE - Timestamp creation failed due to an internal error
    that occurred on the timestamp server