Nginx

NGINX 1.30.0 brought upstream HTTP/1.1 keep-alive into stable as the default. That should improve latency, but it also changes how backend connections are reused, so older apps, auth paths, and inherited proxy config need a proper compatibility review.

Ubuntu 26.04 LTS ships with stricter Apache and Nginx TLS defaults. That is the right move, but because TLS 1.0 and TLS 1.1 are formally deprecated, older partner systems, internal tools, and devices need staged handshake, certificate, and rollback testing before production rollout.