FTP server requires FTPS
Why plain FTP connections fail when a server requires FTPS encryption.
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Verify whether authentication is the actual failure point.
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Some servers reject unencrypted FTP connections and require FTPS.
Common causes
- Server enforces TLS encryption
- Client using plain FTP
- Security policy requiring FTPS
Fix checklist
- Use FTPS explicit mode.
- Ensure client supports TLS.
- Verify correct port configuration.
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Related
- FTP TLS handshake failed — Why FTPS TLS handshakes fail and how to troubleshoot certificate and encryption problems.
- FTPS certificate error — Why FTPS certificate validation fails and how to fix expired or mismatched certificates.
- FTP SSL negotiation failed — Why FTPS SSL negotiation fails and how to fix TLS configuration issues.
- FTPS explicit vs implicit configuration — Understanding explicit vs implicit FTPS and why incorrect configuration causes connection failures.
- Authentication failed — Why FTP/SFTP authentication fails and how to correct credential, key, and account policy issues.
- FTP 530 Login incorrect — How to fix FTP 530 errors: bad credentials, account restrictions, FTPS requirements, and permission issues.
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