![]() You can see for the “ Bad” that the server never sent ALPN. #Verify that ALPN is being sent by both the Client and Server# Transport Layer Security > TLSv1.2 Record Layer: Handshake Protocol: Client Hello > Handshake Protocol: Server Hello Transport Layer Security > TLSv1.2 Record Layer: Handshake Protocol: Client Hello > Handshake Protocol: Client Hello > Cipher Suites The non-profit Wireshark Foundation supports the development of Wireshark, a free, open-source tool used by millions around the world. You are making sure the Cipher Suite is supported by the product and not black listed. #Look to see if the Cipher Suite is Black Listed# You can check the Cipher Suite Black List: If you’re having any issues with HTTP2, it’s important to do a packet capture to see a) what Cipher is being used because it could be using a blacklisted Cipher Suite and b) confirm that the Client and Serer Hello ALPN’s are being sent. There’s a Client Hello sending the Cipher Suite it supports and there’s a Server Hello picking which Cipher it’s going to use from that list. ![]() When talking about ALPN, the thing to remember is that ALPN is a TLS extension negotiation protocol.
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