'Attempted to perform an unauthorized operation' while calling SocialDataService.asmx

Question

I am calling methods of the SharePoint webservice - Lists.asmx and SocialDataService.asmx via a C# application.

While calling methods of the Lists.asmx works perfectly fine, methods of the SocialDataService.asmx on the same list/list items fail with a SoapException with the message Server was unable to process request. ---> Attempted to perform an unauthorized operation.

Is there something specific I need to do in terms of permissions in order to call methods on SocialDataService.asmx ?

Here is a test I have to try and obtain the tags for a specified document -

 var client = new Tests.SharePointSocialDataWebService.SocialDataService();
 client.Credentials = System.Net.CredentialCache.DefaultNetworkCredentials;
 client.Url = TestWebSiteURL + "/_vti_bin/SocialDataService.asmx";
 var tags = client.GetTags("http:sp/sites/sitecollection/website/DocumentLibrary/test.bin");

Answer 1

In order to call GetTags method from SocialDataService service the user should have rights to manage User Profile service application as shown below (All Rights)

otherwise you will get UnauthorizedAccessException exception

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For managing User Profile service application go to Central Administration -> Application Management -> Manage Service Application -> User Profile service application -> Administrators button in Ribbon UI

Answer 2

Important to note that whatever account you use to call the web service, it must also have access to the site through which you call the service. In alwayslearning's question, that was represented by "TestWebSiteUrl".