Problem in Web service callable object!!

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Hi,

I have created a function module in R/3, and made it RFC enabled.Now i am trying to use this webservice in creating CO for web service.Now when i test it, i am getting this error:

Web service method http://<hostname>.<fully qualified domain name>.com:8001/sap/bc/soap/wsdl11?services=ZADDITION&sap-client=400&sap-user=<user ID>&sap-password=<Password>

invocation failed: Invalid Response Code: (401) Unauthorized. The requested URL was:"http://<hostname>.<fully qualified domainname>.com:8001/sap/bc/soap/rfc"; nested exception is:

com.sap.engine.services.webservices.jaxrpc.exceptions.InvalidResponseCodeException: Invalid Response Code: (401) Unauthorized. The requested URL was:"http://<hostname>.<fully qualified domain name>.com:8001/sap/bc/soap/rfc"

What can be the reason??

any help will be highly apprecaiated!!

Thanks & Regards

Ameya