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When using the dns-01 challenge method with "challenge-ready dns", HAProxy retries DNS resolution indefinitely at the interval set by "dns-delay". This adds a "dns-timeout" keyword to set a maximum duration for the DNS check phase (default: 600s). If the next resolution attempt would be scheduled beyond that deadline, the renewal is aborted with an explicit error message. A new "dnsstarttime" field is stored in the acme_ctx to record when DNS resolution began, used to evaluate the timeout on each retry.