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) =>
(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.
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