![]() ![]() The result is that the server opens any non-privileged port (P> 1024) and sends the port p command to the client. The first port connects to port 21 of the server, but unlike the active FTP, the client does not submit the PORT command and allows the server to connect to its data port back and forth. Port 20 from Port 1024 to the FTP server (the client sends an ACK response to the server's data port S 1024 and n + 1 ). Port 20 of the FTP server to port greater than 1024 (the data port S-> C of the server to initialize data connection to the client)Ĥ. Port 21 from any port to the FTP server (client-initiated connection S C of the client)ģ. The server then connects to the data port (n + 1) specified by the client from its own data port (20 ).įor the firewall before the FTP server, you must allow the following communication to support active FTP:ġ. Then the client starts port n + 1 and sends the FTP command "port n + 1" to the FTP server. The active FTP is like this: the client connects to the command port of the FTP server from an arbitrary non-privileged port n (n> 1024), that is, port 21. What is active, what is passive, and why is passive preferred?Īctive FTP (Port FTP), that is, the ordinary FTP slave Passive FTP (Port FTP) ![]() Note: If the built-in firewall is enabled, you must add the above ports in the exception. Microsoft (r) Windows Script Host version 5.6Ĭopyright (c) Microsoft Corporation 1996-2001. You can see the following output When configuring through the adsutil script: vbs set/msftpsvc/passiveportrange "5500-5515" type the following command from the command prompt.Ĭscript.exe c: \ Inetpub \ adminscripts \ adsutil. Type CD Inetpub \ adminscripts and press Enter.ģ. ![]() Click Start, Run, Type cmd, and then OK. Make sure that Enable direct edit metadatabase Check box.Ĭonfigure passiveportrange B using the adsutil script)ġ. The system administrator needs to install Service Pack 4 in the system registry.Ĭhange Passiveportrange For IIS, the execution process is described in the following section.ġ. This attribute keyword only exists in IIS 6.0, and for IIS 5.0 is in Windows 2000. To further limit the range of these huge ports, the system administrator can configure the name Passiveportrange Metadatabase attribute keyword. The response is randomly selected from the default passive-iis ftp mode in the port range of 1024-65535. After the data connection command is issued, the server connects to the client and uses the port to control the client port. Passive mode FTP connection Is sometimes referred to as "Server Management", because the server end port used as a data connection with one of the transient ports server responds to the client PASV Command. ![]()
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