Notes:
Port numbers in computer networking represent communication endpoints. Ports are unsigned 16-bit integers (0-65535) that identify a specific process, or network service. IANA is responsible for internet protocol resources, including the registration of commonly used port numbers for well-known internet services.
Well Known Ports: 0 through 1023.
Registered Ports: 1024 through 49151.
Dynamic/Private : 49152 through 65535.
TCP ports use the Transmission Control Protocol, the most commonly used protocol on the Internet and any TCP/IP network. TCP enables two hosts to establish a connection and exchange streams of data. TCP guarantees delivery of data and that packets will be delivered in the same order in which they were sent. Guaranteed communication/delivery is the key difference between TCP and UDP.
UDP ports use the Datagram Protocol. Like TCP, UDP is used in combination with IP (the Internet Protocol) and facilitates the transmission of datagrams from one computer to applications on another computer, but unlike TCP, UDP is connectionless and does not guarantee reliable communication; it" s="" up="" to="" the="" application="" that="" received="" message="" process="" any="" errors="" and="" verify="" correct="" delivery.="" udp="" is="" often="" used="" with="" time-sensitive="" applications,="" such="" as="" audio="" video="" streaming="" realtime="" gaming,="" where="" dropping="" some="" packets="" preferable="" waiting="" for="" delayed="" data.=""
When troubleshooting unknown open ports, it is useful to find exactly what services/processes are listening to them. This can be accomplished in both Windows command prompt and Linux variants using the 'netstat -aon' command. We also recommend runnig multiple anti-virus/anti-malware scans to rule out the possibility of active malicious software. For more detailed and personalized help please use our forums.
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The Status Indicator Light (SIL) on Mac mini and Mac Pro has different patterns based on the state of your Mac. These patterns also occur on some MacBook, MacBook Pro, MacBook Air, and iMac models, though not all Macs have a SIL. If you have a Mac Pro, learn about the status indicator light behavior on Mac Pro (2019).
Every time you turn on your Mac, it performs various hardware checks. If the SIL flashes one or more times after you turn on the computer, and the pattern repeats after a brief pause, there may be a hardware issue. To isolate the issue, run Apple Diagnostics.
When you press the power button to turn on the computer, the SIL also turns on. As the computer starts up, the SIL stays on until the processor (GPU) has initialized and the display turns on. When the GPU initializes properly, the display turns on and the SIL turns off simultaneously.
On Mac mini models from 2011 and newer, the SIL stays on when the computer is powered on.
While the computer is operating, the SIL remains off. If the display turns off but the computer is still on, the SIL turns on and does not blink. It remains like this until the display turns back on, at which time the SIL turns off again.
On Mac mini models from 2011 and newer, the SIL remains on when the computer is operating.
You can turn on Display Sleep by pressing Control-Shift-Eject. To change your Display Sleep settings, drag the 'Turn display off after' slider in the Energy Saver or Battery pane of System Preferences.
When your Mac sleeps, the SIL pulsates on and off slowly. On Mac mini models introduced in 2018 or later, the SIL stays on when the computer is in sleep. You can customize your Mac's sleep behavior in the Energy Saver or Battery pane of System Preferences.
On Mac notebook computers, if the battery is completely depleted and the computer goes into Safe Sleep, the SIL doesn't illuminate at all.
When you choose the Shut Down command, macOS first turns off the GPU. This turns the display off. When the display turns off, the SIL turns on. During the few seconds of shutdown, but before power is removed from the main logic board, the SIL remains on and will not blink.
When the computer is fully shut down, the SIL turns off.
If Mac mini (M1, 2020) is in firmware recovery mode, the status indicator light rapidly flashes amber three times, briefly flashes amber three times, then rapidly flashes amber three times. This repeats until the computer is turned off. You might need to revive your Mac mini. If you still need help, contact an Apple Authorized Service Provider.