I am trying to call SharePoint web services with "call web service" no

I am trying to call SharePoint web services with "call web service" node and I am getting the error when I input the wsdl url, provide user name, password, domain and click on get services. Below is the error.
The WSDL requires authentication. Please provide valid credentials (APNX-1-4045-006)

Note-
1) Unfortunately we cannot install Appian sharepoint module at this time and so trying to call Sharepoint out of box services
2) I see that NTLM is enabled on sharepoint server
3) Provided the correct user name and password
4) Below is few lines of stack trace in the log

[3/26/14 14:32:51:586 GMT] 000000ff SystemOut O 2014-03-26 14:32:51,586 [WebContainer : 2] ERROR com.appiancorp.process.design.presentation.ProcessDesignAccess - An error occurred while parsing the WSDL (xxx.yyy.org/.../Lists.asmx. The WSDL requires authentication. Please provide valid credentials
[3/26/14 14:32:51:586 GMT] 000000ff SystemOut O 2014-03...

OriginalPostID-104990

OriginalPostID-104990

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