Understanding HTTP/2 Activation Modes on BIG-IP

Hello Rodrigo_Albuque 

Thanks for your article.

So is there any case that the server doesn't respond the extension ALPN in the Server Hello while we still choose ALPN as Activation Mode?

Because we are actually using ALPN mode in our http/2 profile associated with the VS. However, sometime in the Server Hello packet, we see no extension ALPN and then result the client would use http/1.1 and it causes our issue (error message "ERR_HTTP2_PROTOCOL_ERROR" in customer's browser)

With another connection including ALPN extension in Hello Server packet, client will use http/2 and then everything is ok.

Hope to see your advice.

Thank you in advance.