What command did you use to import the certificate? I'm assuming 'certmgr --ssl someuri'?
I'm not entirely sure, but you may also need to import root certificates depending on the generated certificate's trust chain: mozroots --import --ask-remove --machine Also, you should not require The ServerCertificateValidationCallback if the certs are imported into the executing user or the machine store, but it's not a bad idea just to add logging there in case it's something other than trust, like hostname validation. Blindly returning true would be less secure.
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