FTP server in the Cloud: Difference between revisions

If you do not have freedom to choose an alternative to FTP, see the guide below which best matches your operating system

The ports that FTP uses must be open on your VM; see [[Managing_your_cloud_resources_with_OpenStack#Security Groups | this page]] for information about opening ports. FTP uses port 21 to initiate file transfer requests, but the actual transfer can take place on a randomly chosen port above port 1025, though the details of this can vary depending on the mode with which FTP operates in. For example, port 20 can also be involved. This means that to allow FTP access on your VM you must open port 21, possibly port 20, and probably ports 1025 and above. Every open port represents a security risk, which is why other protocols are preferred to FTP. See [http://www.techrepublic.com/article/how-ftp-port-requests-challenge-firewall-security/5031026/ this article] for more details on ports used by FTP.