![]() ![]() This won’t work with the secure FTPS as the control connection is encrypted and the firewall cannot monitor it. So you do not need to have whole port range opened all the time, even when not in use. Some external firewalls are able to monitor FTP control connection and automatically open and close the data connection ports as needed. Learn how to open ports on Microsoft Azure.Ĭlick Apply action to submit your settings. Any time you change this range, you will need to restart FTP service. Use a Data Channel Port Range box for that. In such case, you need to tell the FTP server to use only the range that is opened on the firewall. ![]() You won’t probably want to open whole default port range 1024-65535. When behind an external firewall, you need to open ports for data connections (obviously in addition to opening an FTP port 21 and possibly an implicit TLS/ SSL FTP port 990).
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