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 using a non-whitelisted IP address. 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 contact us should you have further questions.