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TCP and UDP ports used by Apple software products
Apr 27, 2017 Streaming Protocol (RTSP) 2326 rtsp AirPlay, QuickTime Streaming Server (QTSS), streaming media players 587 TCP Message Submission for Mail (Authenticated SMTP) 4409 submission Mail (sending mail), iCloud Mail (SMTP authentication) 600–1023 TCP/UDP Mac OS X RPC-based services — ipcserver NetInfo 623 UDP Lights-Out-Monitoring — asf-rmcp Lights Out Monitoring (LOM) feature of Intel-based Xserve computers, Server Monitor 625 TCP Open Directory Proxy (ODProxy) (unregistered use) — dec_dlm Open Directoryhttps://support.apple.com/en-us/HT202944
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