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TLS 1.2 Issues with IIS "Security Connection Failed"

nuronce

Going to the site is fine. But going to a page that downloads a PDF inline gives this error. Only TLS 1.2 is enabled SSLLabs = A The only difference I can see F12 on FF Network=>Security Key Exchange Group on the working page is "none" on the failed one x25519

Going to the site is fine. But going to a page that downloads a PDF inline gives this error. Only TLS 1.2 is enabled SSLLabs = A The only difference I can see F12 on FF Network=>Security Key Exchange Group on the working page is "none" on the failed one x25519

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If I run fiddler, the problem goes away probably due to the way they mess with HTTPS to be able to decrypt the data.