Hi,
Do you have any portal in your landscape? If yes you can test the web service using the below settings.
goto SOAMANAGER -> Technical administration -> SAP Client settings -> web service navigation
here give your portal system hostname and port.
Now go to web service in the SOA Manager -> Overview and click on
Open Web Service navigator for selected binding
Portal page will open and then enter the wsdl url here and check the web service.
If all thinks are working fine than you need to tell the >net team to fix the issue as its not an issue with sap application.
Thanks
Rishi Abrol