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1. www.lifewire.com › tcp-port-21-818146TCP Port Number 21 and How It Works With FTP - Lifewire

   www.lifewire.com › tcp-port-21-818146

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   16 lip 2021 · TCP Port Number 21 and How It Works With FTP. Port 21 controls the FTP session. The File Transfer Protocol provides a framework to transfer information between two networked computers, much like Hypertext Transfer Protocol does through a web browser.

2. superuser.com › questions › 965560windows - Port 21 is open but I can't connect to FTP server -...

   superuser.com › questions › 965560

   1 wrz 2015 · Port 21 is open but I can't connect to FTP server. Ask Question. Asked 9 years, 1 month ago. Modified 9 years, 1 month ago. Viewed 39k times. 0. I have a very basic FTP server running on Windows 10. Right now, I have no trouble accessing this server from my WLAN.

3. learn.microsoft.com › en-us › troubleshootService overview and network port requirements - Windows Server...

   learn.microsoft.com › en-us › troubleshoot

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   26 gru 2023 · This article discusses the required network ports, protocols, and services that are used by Microsoft client and server operating systems, server-based programs, and their subcomponents in the Microsoft Windows Server system.

4. pliki.wiki › blog › numer-portu-tcp-21-i-jak-to-dziala-z-ftpNumer portu TCP 21 i jak to działa z FTP – Blog - Pliki

   pliki.wiki › blog › numer-portu-tcp-21-i-jak-to-dziala-z-ftp

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   2 paź 2020 · Użyj narzędzia do sprawdzania portów, aby przeskanować swoją sieć, aby sprawdzić, czy router ma otwarty port 21. Funkcja zwana trybem pasywnym pomaga sprawdzić, czy za routerem znajdują się bariery w dostępie do portu.

5. www.speedguide.net › portPort 21 (tcp/udp) :: SpeedGuide

   www.speedguide.net › port

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   SG Ports Services and Protocols - Port 21 tcp/udp information, official and unofficial assignments, known security risks, trojans and applications use.

6. learn.microsoft.com › en-us › windows-hardwareWindows network architecture and the OSI model

   learn.microsoft.com › en-us › windows-hardware

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   15 gru 2023 · The Microsoft Windows operating systems use a network architecture that is based on the seven-layer networking model developed by the International Organization for Standardization (ISO) in 1978.

7. en.wikipedia.org › wiki › List_of_TCP_and_UDP_port_numbersList of TCP and UDP port numbers - Wikipedia

   en.wikipedia.org › wiki › List_of_TCP_and_UDP_port_numbers

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   This is a list of TCP and UDP port numbers used by protocols for operation of network applications. The Transmission Control Protocol (TCP) and the User Datagram Protocol (UDP) only need one port for duplex , bidirectional traffic.