I am testing against an HTTPS intranet server that Fiddler is unable to proxy to. I set the Protocols to <client>;tls1.2 and that did not work. I changed back to tls 1.0.
I restarted Fiddler with this as the Protocols list:
Wireshark shows Fiddler is still sending a Client Hello with TLS 1.2!
Please add additional logging / troubleshooting.
14:23:17:3284 Assembly 'C:\Users\xxxx\AppData\Local\Programs\Fiddler\CertMaker.dll' was not found. Using default Certificate Generator.
14:23:17:3349 /Fiddler.CertMaker> Using .+ for certificate generation; UseWildcards=True.