Unable to integrate web service (SOAP API) in Designer in v9.2

Hi Team,

We are trying to onboard/integrate a SOAP API using 'Integrate Web service' in Designer.

We have used

1) .net namspace for proxy: Test123

2) wsdl URL : xyz.xom/gateway.asmx

3) web service url : same above url

4) service type : SOAP , Locked

5) wsdl.exe location : saved in downloads folder.

Check -> Connection is successful.

But in the second screen "Creating proxy code" runs and displays an error message 

Error: Creating proxy code.

Calling C:\users\xyz\downloads\wsdl\wsdl.exe /nologo /language:vb

"/namepsaceDEF" "/out:C:\Users\xyz\AppData\Local\Temp\13\unm5hoc3.yno.vb"

"">xyz.xom/gateway.asmx returend with error code 1/

The underlying connection was closed: An unexpected error occured on a send. - Unable to read data from the trasnport connection: An existing connection was forcibly cloded by the remote host 

The same above wsdl url, we are able to access it using SOAP UI.

Any idea what can be the issue ?