FTP TLS handshake failed
Why FTPS TLS handshakes fail and how to troubleshoot certificate and encryption problems.
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Verify whether authentication is the actual failure point.
Shareable output
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TLS handshake failures occur before authentication when the secure connection cannot be established.
Common causes
- Invalid certificate
- Protocol mismatch
- Unsupported TLS version
- Firewall interfering with TLS negotiation
Fix checklist
- Verify TLS version compatibility.
- Check server certificate validity.
- Ensure FTPS explicit or implicit mode is correct.
- Review firewall or proxy inspection rules.
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Related
- 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.
- FTP server requires FTPS — Why plain FTP connections fail when a server requires FTPS encryption.
- 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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