I faced INVALID_SESSION_ID  exception calling getUserInfo() of SalesforceAppExPartnerAPI.SforceService from my .net web service.


my code:
Code:

SalesforceAppExPartnerAPI.GetUserInfoResult userInfoResult = Binding.getUserInfo();


 Binding is property where _authHeader.EXTSessionID and _authHeader.EXTServerLocation are values passed to web service from salesforce portal.
_autHeader.ExtSessionID value retrieved via apex code : UserInfo.getSessionId() and _authHeader.ExtServerLocation is
https://na6-api.salesforce.com/services/Soap/u/12.0/511500D80000000Kb2v

Code:

    private SalesforceAppExPartnerAPI.SforceService Binding {
            get {
        
                    try {                        

                        // binding
                        SalesforceAppExPartnerAPI.SforceService binding = new SalesforceAppExPartnerAPI.SforceService();
                        // by setting these values, we are essentially logged in to the API as this user
                        binding.SessionHeaderValue = new SalesforceAppExPartnerAPI.SessionHeader();
                        binding.SessionHeaderValue.sessionId = _authHeader.EXTSessionID;
                        binding.Url = _authHeader.EXTServerLocation;
                                    

                        return binding;
                    } catch (System.Web.Services.Protocols.SoapException exsoap) {
                        if (exsoap.Code.ToString().Contains("API_DISABLED_FOR_ORG")) {
                            throw new EXTAPIAuthFail("This edition of salesforce.com does not provide API access."
                                + "API access is a standard feature of Enterprise "
                                + "and Unlimited Editions.<br>"
                                + "Certify your application to gain API access to "
                                + "Professional Edition as well.<br><br>", exsoap);
                        } else {
                            throw new EXTAPIAuthFail("SoapException: Unable to validate incoming web call.", exsoap);
                        }
                    } catch (System.UriFormatException uriEx) {
                        throw new EXTAPIAuthFail("The Server URL is invalid. " + uriEx.Message, uriEx);
                    } catch (Exception e) {
                        throw new EXTAPIAuthFail("Unable to connect to the API. " + e.Message, e);
                    }
                } else {
                    return _binding;
                }
            }
        }


 
Exception Stack trace:

Code:

{System.Web.Services.Protocols.SoapException: INVALID_SESSION_ID: Invalid Session ID found in SessionHeader: Illegal Session
   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 Mindflash.SalesforceAppExPartnerAPI.SforceService.getUserInfo()

 

It works fine before salesforce introduced winter9 release and version 14.0 API.