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Auto ignore certificate errors and DON'T proceed

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FiddlerCore
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Steven
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Steven asked on 09 Jan 2018, 05:05 PM

Every time Fiddler encounters a certificate error it prompts me on whether to ignore the error and proceed or not.

I know I can go into Tools --> Options --> HTTPS --> and check Ignore Server Certificate errors (unsafe) - but that is the opposite of what I want to do.

 

I want to NOT proceed for all certificate errors without being prompted. Is there a way to accomplish this?

For various reasons in our environment I encounter a lot of certificate errors and I never want to proceed on them and clicking "No" through dozens of ignore certificate error? is tiresome.

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Simeon
Telerik team
answered on 15 Jan 2018, 06:35 PM
Hello,

You could use the FiddlerScript to attach to the FiddlerApplication.OnValidateServerCertificate event.

For example, in the Main method of your FiddlerScript you could add the following code:
FiddlerApplication.OnValidateServerCertificate += (sender, ea) =>
{
    if(ea.CertificatePolicyErrors != SslPolicyErrors.None)
    {
        ea.ValidityState = CertificateValidity.ForceInvalid;
    }
};

This is just an example how to set the ValidityState. Of course, you could use your own business rules for this.

Regards,
Simeon
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Steven
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answered on 02 Feb 2018, 11:14 PM
worked like a charm. thanks.
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Jon
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answered on 06 May 2020, 12:17 AM

If you are in the fiddler script window, you want:

 

static function ValidateCert(sender, ea: ValidateServerCertificateEventArgs)
{
if(ea.CertificatePolicyErrors != System.Net.Security.SslPolicyErrors.None)
{
ea.ValidityState = CertificateValidity.ForceInvalid;
}
}

    static function Main() {
        ...  
FiddlerApplication.add_OnValidateServerCertificate(ValidateCert);
    }

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Simeon
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Steven
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Jon
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