Web Service Url not available

Hello,

nearly 2 years ago a colleague made a demo with a sap service. The url for the web service was http://localhost:8080/sap/bc/soap/wsdl11?services=Z_SD_FAKTURA_DEMO&sap-client=800

When i try to open the url with IE now, i get an error "the page cannot be displayed".

I have no SAP skills and so i have idea, which could be wrong.

Were can i find the web service in sap?

Has someone an idea how i can start or check the status of an Web Service in SAP?

I don't want to change the web service now, i only want to add the web reference to my c# project.

thanks very much

Gerhard