Internet TCP port 9000 is commonly used by the DBGp Debugging Protocol, which is a debugging protocol used in software development. It is also used by the PHP-FPM service, a popular FastCGI process manager for PHP. Additionally, the Play! Framework, a high-velocity web framework for Java and Scala, uses this port for HTTP communication. Swoole, a coroutine-based concurrency library for PHP, also uses port 9000.
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