The error message might look like this:
org.apache.axis2.AxisFault: Transport error: 403 Error: Forbidden at org.apache.axis2.transport.http.HTTPSender.handleResponse(HTTPSender.java:310)
This can occur when you are calling from an IP address that was not added to Hubject's whitelist. Please check if the IP address you are using for the outgoing connection was provided to Hubject during the onboarding process in the technical questionnaire and submit a request should you have further questions.