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https://bugs.php.net/bug.php?id=74166 A host system with no/limited IPv6 support will fail at binding the IPv6 ANYADDR address (::) as the address family is unsupported. Deal with this by handling failure to implicitly bind to :: as a soft failure, falling back to 0.0.0.0. If binding to :: failed for some other reason (e.g. port in use) then binding to 0.0.0.0 will likely fail as well, but we'll get appropriate warnings for that.