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When using ftp7.5 on server2008, which ports should I open in the firewall?
Port 20 is used for FTP control port, and port 2 1 is used for FTP transmission port;

I don't know if you know the active and passive modes of FTP. Generally, the client accesses FTP in passive mode, and the passive mode server will open a high-end confession client to connect at will. That is to say, in addition to ports 20 and 2 1, some ports higher than 1024 should be opened for clients to access FTP.