Internet TCP port 10021 is commonly used by the FTP protocol for data transfers. Specifically, it is used by the FileZilla Server, an open-source FTP server, which uses this port for passive mode data connections. This port is also used by the WS_FTP Server, a widely used FTP server software. It's important to note that the usage of this port can be configured based on the requirements of the specific software or system.
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