c# - XP gives Error 1825 when trying to connect to my web service -

I am creating an application with C # using W2k8 + IIS7 / SQLExpress 2008 / Web service / Windows client. I am very advised how I am learning SQL and IIS setup and security for everyone. I do not need strict SSL protection or any of that, because it is an intranet page inside my company. I know that I setup STQL and IIS to use NTUTH services and SQL is in mixed mode.

Everything is working on Vista and Win7, except the Windows XP 3 x 86, which will not talk to the service. The purpose of client's windows, collecting machine specs through WMI and making it web Send to service Even when I install VS 2008 SP1 on the machine to do some remote debugging (connected to the process on my server), I receive this error code 1825:

Windows Error Message 1825: 'RPC_S_SEC_PKG_ERROR' A security package specific error occurred.

Does anyone have any ideas about deciding this? Or what's happening due to this? It is just a work or gremlins ... or yourself decide to do it. - Changing the 'connection timed out' to default from 2 months to 8 minutes in the website's IIS settings, the whole dong decides the matter.