Having trouble connecting to an Electric Charger over SOAP

Hi all,

My electric charger communicates over OCPP which is basically a protocol for electric vehicles, chargers etc to talk to each other. It utilises SOAP for communications.

I have tried to connect to my charger using SoapUI but doesn't seem to work.

What I have done:

1) I have loaded the WSDL file: https://raw.githubusercontent.com/knutster/OCPP/master/ocpp_chargepointservice_1.5_final.wsdl

2) At the bottom of the WSDL file I have changed the address location to the charger's OCPP endpoint addess

3) The WSDL loads fine and it has all the bindings that is listed in the spec.  When I double click a binding request, modify the relevant parameters of the package and then send it, I get in return: Error getting response; org.apache.http.NoHttpResponseException: The target server failed to respond.

I was wondering if anyone had any idea at all at what could be the possible causes of this.

Any assistance is appreciated!