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What's ALPN?ALPN, or Application-Layer Protocol Negotiation, is a TLS extension that includes the protocol negotiation within the exchange of hello messages.
And if the tool here says ALPN is not supported, what can be done?Talk to your server administrator. They may have plans in the making. Most providers are in transition to these new protocols.
And if the tool here says ALPN is not supported, what can be done?
Many servers will need significant upgrades
...there don't seem to be any plans to add HTTP/2 support to older versions of Windows ServerLikely by design. M$ has shown a strong preference to force retirement of older builds of public facing platforms.