c# ebay api, works on W7 but not on xp

Question

I developed an application that use the "finditemsAdvanced" api call of ebay. It works without problem on windows 7 but when i try it on xp machines the function returns null!!!! I tried to debug it on xp, with vs2010 and vs 2008 but nothing!!!!

here the search class:

 public SearchResult Search(Job searchedjob)
    {
        try
        {
            EbayFind service = new EbayFind();
            service.Url = "http://svcs.ebay.com/services/search/FindingService/v1";


            FindItemsAdvancedRequest findrequest = new FindItemsAdvancedRequest();

            ItemFilter[] filtro = new ItemFilter[1];
            int filter = 0;

            //Tempo rimanente
            filtro[filter] = new ItemFilter();
            filtro[filter].name = ItemFilterType.EndTimeTo;
            filtro[filter].value = new string[] { searchedjob.TimeLeft.ToString("yyyy-MM-ddTHH:mm:ss.000Z") };
            filter++;


            findrequest.keywords = "canon";
            findrequest.itemFilter = filtro;
            findrequest.descriptionSearch = false;

            // Setting the pagination
            PaginationInput pagination = new PaginationInput();
            pagination.entriesPerPageSpecified = true;
            pagination.entriesPerPage = 25;
            pagination.pageNumberSpecified = true;
            pagination.pageNumber = 1;
            findrequest.paginationInput = pagination;

            findrequest.paginationInput = pagination;

            // Creating an object to the BestMatchService class

            FindItemsAdvancedResponse resp = service.findItemsAdvanced(findrequest);
            SearchResult res = resp.searchResult;

            return res;
        }

and here the ebay call:

 class EbayFind : FindingService
{
    protected override System.Net.WebRequest GetWebRequest(Uri uri)
    {

        try
        {

            HttpWebRequest request = (HttpWebRequest)base.GetWebRequest(uri);
            request.Headers.Add("X-EBAY-SOA-SECURITY-APPNAME", "myappid");
            request.Headers.Add("X-EBAY-SOA-OPERATION-NAME", "findItemsAdvanced");
            request.Headers.Add("X-EBAY-SOA-SERVICE-NAME", "FindingService");
            request.Headers.Add("X-EBAY-SOA-MESSAGE-PROTOCOL", "SOAP11");
            request.Headers.Add("X-EBAY-SOA-SERVICE-VERSION", "1.0.0");
            request.Headers.Add("X-EBAY-SOA-GLOBAL-ID", "EBAY-US");
            return request;

        }

        catch (Exception ex)
        {
            throw ex;
        }

    }
}

}

This code works on w7 machines, i don't understand why "res" is always null on xp!!! The net framework installed is 3.5 and 4.0, it's not a framework issue i think. Any ideas??

Thanks!

Answer 1

Stab in the dark -- Windows Firewall.

Try disabling it in the control panel while debugging. If it makes a difference, configure an exception to allow the api calls from your application through.

Answer 2

I disabled windows firewall but nothing changed :( I tried on 2 different xp machines. I have no idea, the connection is working and i contact the ebay servers, if not i retrieve an exception.