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Hello, The IPN simulator only tests sending an IPN, it doesn't confirm if your posting back for validation or if that postback was conducted via TLSv1.2 You should check your webserver logs for the postback attempt and if it was accepted by the sandbox server. If it was accepted and you receive either a "VALID" or "INVALID" response, you then know you were able to establish a connection secured via TLSv1.2
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