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chromic · Jun 29, 2026

haproxy 3.3 sets SNI by default

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The last sentence of my previous post was: Now I need to figure out why all my stunnel s are broken. Upgrading from Alpine 3.23 to 3.24 upgraded my haproxy from 3.2.x to 3.4.x. It turns out that starting with 3.3, haproxy automatically sets an SNI value from the “host” HTTP header and forward it to the backend server . All my stunnel instances only serve a single application, and use a…

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