How to ignore a certificate error with c# 2.0 WebClient – without the certificate

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The SSL certificate is for a machine to establish a trust relationship. If you type in one IP address, and end up talking to another, that sounds the same as a DNS hijack security fault, the kind of thing SSL is intending to help you avoid – and perhaps something you don’t want to put up with from “them”.

If you may end up talking to more than machine (ideally they would make it appear as one for you), you will need a certificate for each of the possible machines to initiate trust.

To ignore trust (I’ve only ever had to do this temporarily in development scenarios) the following snippet may work for you, but I strongly recommend you consider the impact of ignoring trust before using it:

public static void InitiateSSLTrust()
{
    try
    {
        //Change SSL checks so that all checks pass
        ServicePointManager.ServerCertificateValidationCallback =
           new RemoteCertificateValidationCallback(
                delegate
                { return true; }
            );
    }
    catch (Exception ex)
    {
        ActivityLog.InsertSyncActivity(ex);
    }
}

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