Data transferred to an ISP’s local server often stays within the ISP’s infrastructure, reducing exposure to the open internet.
| Error Code | Message | Likely Cause on Netcom ISP | Solution | |------------|---------|----------------------------|----------| | 425 | "Can't open data connection" | Passive mode ports blocked or misconfigured | Ensure port range 50000-50100 is forwarded and allowed in Windows Firewall | | 530 | "Login incorrect" | Invalid username/password or user shell not set | For Linux, set user shell to /sbin/nologin and proper password | | 500 | "Illegal PORT command" | FTP client sending active mode behind NAT | Switch client to | | 421 | "Too many connections" | Netcom ISP may limit concurrent sessions per IP | Reduce max clients in FTP server settings | | 553 | "Read-only file system" | Permissions issue on the shared directory | chmod 755 on directory and ensure correct ownership | netcom isp ftp server
Assuming you have a business-grade Netcom ISP connection with a routable public IPv4 address, follow these steps to set up your FTP server. Data transferred to an ISP’s local server often