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Certificate Objective 403.7

So, I have the following system: there is a client application that requests the service as follows:

blar.ServiceSecurity wsSecurity = new blar.ServiceSecurity();
wsSecurity.Url = this.tURL + "Security.asmx";
CookieContainer cc = new CookieContainer();
wsSecurity.CookieContainer = cc;
wsSecurity.ClientCertificates.Add(X509Certificate.CreateFromCertFile(certPath));

blar.LoginResult lr = wsSecurity.Login(login, password);

then the web service in this.tURL + "Security.asmx" Loginshould get this ClientCertificate (certPath) from:

Context.Request.ClientCertificate.Certificate;

and do something with it.

There are two problems:
if IIS is configured Require client certificates, I get a 403.7 error when I call the login function.
if the IIS configuration says Accept client certificates, I get a CryptographicException "m_safeCertContext - invalid descriptor";

but , these problems only occur if the client is running Windows 7 x64, even when it is running on Windows XP or Windows Server 2003, it is just fine.

ca , ,
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