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After the configuration parsing, when its validity check, an implicit tcp-check connect rule is added in front of the tcp-check ruleset if the first non-comment rule is not a connect one. This implicit rule is flagged to use the default check parameter. This means now, all tcp-check rulesets begin with a connect and are never empty. When tcp-check healthchecks are used, all connections are thus handled by tcpcheck_main() function.