I have a given certificate installed on my server. That certificate has valid dates, and seems perfectly valid in the Windows certificates MMC snap-in.

However, when I try to read the certificate, in order to use it in an HttpRequest, I can't find it. Here is the code used:

    X509Store store = new X509Store(StoreName.Root, StoreLocation.LocalMachine);
    store.Open(OpenFlags.ReadOnly); X509Certificate2Collection col =
    store.Certificates.Find(X509FindType.FindBySerialNumber, "xxx", true);

xxx is the serial number; the argument true means "only valid certificates". The returned collection is empty.

The strange thing is that if I pass false, indicating invalid certificates are acceptable, the collection contains one element—the certificate with the specified serial number.

In conclusion: the certificate appears valid, but the Find method treats it as invalid! Why?

c# ssl certificate x509
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