Running DNN v 6.2.3 (141)

I wrote a MVC controller inheriting from DnnController with an action method that takes two parameters, including a portalID per other discussions I have read.

Here is the chrome developer tool request/response log.

1. Request URL:
   https://cloud.foo.com/mosaicdnn/DesktopModules/Mosaic.SSOWeb/API/CreateUser/MosaicSynch
2. Request Method:
   POST
3. Status Code:
   
   302 Found
4. Request Headersview source
   1. Accept:
      */*
   2. Accept-Charset:
      ISO-8859-1,utf-8;q=0.7,*;q=0.3
   3. Accept-Encoding:
      gzip,deflate,sdch
   4. Accept-Language:
      en-US,en;q=0.8
   5. Connection:
      keep-alive
   6. Content-Length:
      79
   7. Content-Type:
      application/json; charset=UTF-8
   8. Cookie:
      __utma=191705967.889622115.1352305060.1352305060.1352305060.1; __utmz=191705967.1352305060.1.1.utmcsr=(direct)|utmccn=(direct)|utmcmd=(none); wp2106="VUTZDs-TTHU:WDtlnDl-TYVX-UVTBDDDTUCBWM"; .ASPXANONYMOUS=Fenb_8AQzgEkAAAAY2VlNjA3MTUtYzhjMC00OTRjLTlmOWYtMDAxODhmMzc5OGJi0; ASP.NET_SessionId=wbg5j3xcwax0hsvyvtxgefo3; authentication=DNN; .DOTNETNUKE=B93038A1B942BDCB931F797B62624EE2250BD8F9E9F9139702339992BA92624BD7470406042010CA402DED52D69CCA001F673674C5F9BE8AC839ADC7E58F36C05B71AF21A5242A23A23EDC62964FEC16451719BC223463EDBC595205A5E22C90BF568DE6A47625B7C3B6247F; language=en-US; .MosaicCookie=
   9. Host:
      cloud.foo.com
   10. Origin:
       https://cloud.foo.com
   11. Referer:
       https://cloud.threeriverssystems.com/mosaicdnn/student/Home.aspx?portalID=1
   12. User-Agent:
       Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.11 (KHTML, like Gecko) Chrome/23.0.1271.97 Safari/537.11
   13. X-Requested-With:
       XMLHttpRequest
5. Request Payload
   1. portalID=1&mosaicuri=https%3A%2F%2Fcloud.foo.com%2FCAMSMosaic%2F
6. Response Headersview source
   1. Cache-Control:
      private
   2. Connection:
      close
   3. Content-Type:
      text/html
   4. Date:
      Fri, 14 Dec 2012 20:18:41 GMT
   5. Location:
      https://cloud.foo.com/mosaicdnn/DesktopModules/Mosaic.SSOWeb/API/CreateUser/MosaicSynch
   6. Server:
      Microsoft-IIS/7.5
   7. Set-Cookie:
      .DOTNETNUKE=; expires=Tue, 12-Oct-1999 05:00:00 GMT; path=/; secure; HttpOnly
   8. Set-Cookie:
      language=; path=/; HttpOnly
   9. Set-Cookie:
      authentication=; path=/; HttpOnly
   10. Set-Cookie:
       portalaliasid=; expires=Tue, 14-Dec-1982 20:18:41 GMT; path=/; HttpOnly
   11. Set-Cookie:
       portalroles=; expires=Tue, 14-Dec-1982 20:18:41 GMT; path=/; HttpOnly
   12. X-AspNet-Version:
       4.0.30319
   13. X-AspNetMvc-Version:
       2.0
   14. X-Powered-By:
       ASP.NET

My understanding is that by putting portalID into the URL of the AJAX post, the DNN runtime should not think I am changing portal.  But as the request/response above shows, I am passing in the current portalID of the referrer, and the DNN forms auth cookie is still being removed.

I am using a Razor script to make the call, using the DNN controller framework to get the current portalID:

Here is a snipper:

@{
    String p = "";
    DotNetNuke.Entities.Users.UserInfo u = DotNetNuke.Entities.Users.UserController.GetCurrentUserInfo();
    Boolean anon = (!String.IsNullOrEmpty(u.Username) && u.PortalID >= 0 && this.Context.Request.Cookies[FormsAuthentication.FormsCookieName] != null);

....

<script type="text/javascript">
        $(document).ready(function () {
            // initialize menu
            $(function () {
                $.ajax({
                    url: '@url',
                    type: 'POST',
                    data: {
                        portalID: @u.PortalID,

where I actually use the current user's portalID to pass to the method detailed in the request/response information above.

BTW, I have tried doing this with a POST (as above) and as a GET, with the same results.  Ultimately, the service method is defining cookies in the response stream to enable SSO with an external system that already has SSO.

 I appreciate any help.

 Kyle