Knowledgebase

When we use FTP clients to connect to hosts, we often encounter problems such as inability to connect and even error messages. For example, when connecting to an FTP site, an error message of "227 Entering Passive Mode" usually indicates that the FTP client cannot establish a data connection. To solve this problem, you can try the following methods:
1. Check firewall settings
Ensure that your firewall allows FTP connections to pass through. Sometimes, firewalls may prevent the establishment of FTP data connections. You can try disabling the firewall or adding FTP related rules to the firewall.
2. Check network configuration
If you are using a router or network proxy, you may need to check its configuration to ensure that the FTP connection can pass smoothly. Sometimes, routers or proxy servers may interfere with the establishment of FTP data connections.
3. Check FTP server configuration
If you are connecting to a self built FTP server, you need to ensure that the server configuration is correct. In the configuration file of an FTP server, there is usually a setting for Passive Mode to ensure that it is correctly configured and points to the correct IP address and port range.
4. Use active mode
Try switching to Active Mode instead of Passive Mode on the FTP client. In some cases, passive mode may encounter connection issues, while switching to active mode can solve the problem. You can find the relevant options in the settings of the FTP client to make changes.
If none of the above methods can solve the problem, it is recommended to check the logs and error messages of the FTP server for more detailed information. Additionally, if possible, you can also try using other FTP clients to connect and determine if the issue is specific to a particular client.