Hello, PHP 5.5.20RC1 is available for testing. You can download it from http://downloads.php.net/jpauli/ The Windows binaries are available at http://windows.php.net/qa/ This release contains a number of bugfixes, many of them about the PHP-FPM IPV6 support feature. We'd like to point you to this particular part for your testing strategy. For the list of bugfixes that you can target in your testing, please refer to the NEWS file: https://github.com/php/php-src/blob/php-5.5.20RC1/NEWS Please test it carefully, and report any bugs in the bug system. The stable release is planned for December 11th, if no critical issues will be discovered in the RC. Thank you for your support. Julien Pauli & David Soria Parra