Get or set security credentials for XML web service client authentication

Question

Dear,
I wrote a custom asp.net web service that acts as a wrapper for the taxonomyclientservice.asmx in sharepoint 2010.
ON my local machine, the following code works:
  using (Taxonomy.Taxonomywebservice TaxonomyClient = new COSMOS_Taxonomy.Taxonomywebservice())
TaxonomyClient.Credentials = new NetworkCredential("username", "pass", "domain");
TaxonomyClient.PreAuthenticate = true;
etc..
The authentication works when i provide the user credentials.
the problem is when i deploy the webservice to my production env. I dont know the owner of the metadata term store and its out of the question to get the username and password.
when i try to run this code on my local machine:
TaxonomyClient.Credentials = System.Net.CredentialCache.DefaultCredentials;
i get this error:
System.Net.WebException: The request failed with HTTP status 401: Unauthorized.
at System.Web.Services.Protocols.SoapHttpClientProtocol.ReadResponse(SoapClientMessage message, WebResponse response, Stream responseStream, Boolean asyncCall)
at System.Web.Services.Protocols.SoapHttpClientProtocol.Invoke(String methodName, Object[] parameters)
at COSMOS_TermSet.COSMOS_Taxonomy.Taxonomywebservice.GetTermSets(String sharedServiceIds, String termSetIds, Int32 lcid, String clientTimeStamps, String clientVersions, String& serverTermSetTimeStampXml)
at COSMOS_TermSet.CustomWebService.GetCountryTermSet()
How can i fix this.
Many thanks in advance

Answer 1

Hi Roni,
Based on your description, the error occurred when using the DefaultCredential in the code.
I recommend to check if the “<identity impersonate="true"></identity>” is included in web.config file.
If not, add it to web.config file to see if the issue still occurs.
Best regards.
Thanks
Victoria Xia
TechNet Community Support