FAQ

General FAQ

• I am having trouble running the samples, what can I do to debug them?
• I receive a timeout, "dxlclient.exceptions.WaitTimeoutException: Timeout waiting for response to message", when attempting to invoke an ePO command via DXL
• I receive an error similar to the following, "Error: hostname '192.168.130.130' doesn't match 'epotestserver' (0)", when attempting to invoke an ePO command via DXL
• I receive an error similar to the following, "Error: [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:590) (0)", when attempting to invoke an ePO command via DXL
• I receive an error similar to the following, "Error: unable to locate service for request (-2147483647)", when attempting to invoke an ePO command via DXL

General

Q: I am having trouble running the samples, what can I do to debug them?

A: The following steps are generally useful for debugging the samples:

• Ensure the prerequisites for the ePO DXL service have been met.

• Switch from ERROR to DEBUG logging in the samples as shown below:

  # Configure local logger
  logging.getLogger().setLevel(logging.ERROR)

  Change to:

  # Configure local logger
  logging.getLogger().setLevel(logging.DEBUG)

Q: I receive a timeout, "dxlclient.exceptions.WaitTimeoutException: Timeout waiting for response to message", when attempting to invoke an ePO command via DXL

A: This typically occurs due to the Python client not having permission to send messages to the topic associated with the ePO server.

The following page provides information about authorizing clients to access the ePO DXL service:

https://opendxl.github.io/opendxl-epo-service-python/pydoc/authorization.html#client-authorization

Q: I receive an error similar to the following, "Error: hostname '192.168.130.130' doesn't match 'epotestserver' (0)", when attempting to invoke an ePO command via DXL

A: This occurs when the host specified in the service configuration file does not match the hostname in the ePO server's certificate.

The following page provides information about validating the ePO server's certificate:

https://opendxl.github.io/opendxl-epo-service-python/pydoc/epocertverification.html

Q: I receive an error similar to the following, "Error: [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:590) (0)", when attempting to invoke an ePO command via DXL

A: This occurs when the CA bundle as specified in the service configuration file does not contain the certificate for the CA that signed the ePO server's certificate.

The following page provides information about validating the ePO server's certificate:

https://opendxl.github.io/opendxl-epo-service-python/pydoc/epocertverification.html

Q: I receive an error similar to the following, "Error: unable to locate service for request (-2147483647)", when attempting to invoke an ePO command via DX

A: There are a couple common reasons why this error occurs:

• The ePO DXL service is not running.
• The uniqueId specified in the request (last portion of the request topic) does not match the unique identifier defined in the service configuration file.