1) Load the attached .farx file in to Fiddler for autoresponse
2) Run the attached load test

Expected: No errors in the log
Actual:
[05/29 16:35:33,Telerik.TestStudio.Load.Agent.exe(30308:14),Error] OutstandingRequest.Run() : EXCEPTION! (see below)
     Situation: Exception during HTTP Request, url [https://qa.pega.com/prgateway/PRPCGateway/pcdqa/!PCD/$STANDARD/?pyActivity=%40baseclass.doUIAction&action=createNewWork&className=PCD-Work-Registration&flowName=Subscribe&ServiceID=PDC&Feature=PDC2&IPAddress=106.51.134.19&UserId=PegaWebsite&SenderTime=20150528132451&pw=1520f05761d427b32c8df4de8ef1c012]
     Outer Exception Type: System.Net.CookieException
     Message: The 'Domain'='qa.pega.com' part of the cookie is invalid.
     HRESULT: 0x80131537 (Official ID (if app.) = COR_E_FORMAT, Error Bit = FAILED, Facility = FACILITY_URT, Code = 5431)
     Call Stack:
          at System.Net.Cookie.VerifySetDefaults(CookieVariant variant, Uri uri, Boolean isLocalDomain, String localDomain, Boolean set_default, Boolean isThrow)
          at System.Net.CookieContainer.Add(Cookie cookie)
          at Telerik.TestingFramework.Net.HttpRequestBuilder.CreateHttpWebRequest()
          at Telerik.TestStudio.Load.Http.OutstandingRequest.<Run>d__0.MoveNext()

[05/29 16:35:33,Telerik.TestStudio.Load.Agent.exe(30308:14),Load] AsyncMethodBuilderCore.Start() : An outstanding request finished, but was marked as a failed request.

In addition, if you look closely at the GET request sent by the load test you will notice it's missing the cookie that was set in the preceeding POST.