FTPS Connection Tester

Test Implicit or Explicit FTPS connections, verify TLS encryption is working, and inspect the server certificate — no software needed.

Your credentials are used only to test your server and are never logged or stored.
Passive mode (recommended)

Looking for plain FTP?

This tool tests FTPS (FTP over TLS). For unencrypted FTP servers on port 21, use the FTP Connection Tester instead.

FTP Tester

FTPS vs SFTP — what's the difference?

FTPS (FTP Secure) adds TLS encryption to the standard FTP protocol. It operates in two modes: Explicit FTPS (FTPES) starts unencrypted on port 21 and upgrades via the AUTH TLS command, while Implicit FTPS uses a dedicated TLS-only port (typically 990).

Common FTPS connection issues

  • Certificate errors — self-signed or expired TLS certificate on the server side.
  • TLS handshake failure — incompatible TLS versions between client and server.
  • Passive mode data port blocked — the firewall is not forwarding the passive data ports.
  • Wrong mode — connecting in Implicit mode to an Explicit-only port (or vice versa).