Authentication Error: 403 While Trying to Create Part Catalog

Content

Hi, 

 I am trying to Create Catalog using SOAP API . And getting the Following Response 

<SOAP-ENV:Envelope xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/&quot; xmlns:ns1="urn:toatech:PartsCatalog:1.0">
   <SOAP-ENV:Body>
      <ns1:create_catalog_response>
         <result_code>403</result_code>
         <error_msg>Authentication failed</error_msg>
      </ns1:create_catalog_response>
   </SOAP-ENV:Body>
</SOAP-ENV:Envelope>

Could Someone explain me what could be the possible reason for it and how to rectify it .

Regards,

Prashant Singh Bhadauria