Article ID: 125162, created on Apr 8, 2015, last review on Jul 29, 2016

  • Applies to:
  • Plesk 12.0 for Linux
  • Plesk 11.5 for Linux
  • Plesk 12.0 for Windows
  • Plesk 11.5 for Windows


Cannot connect to FTP storage with FileZilla 3.10 using the Encryption setting "Use explicit FTP over TLS if available". The connection fails by timeout.

Error:  The data connection could not be established: ETIMEDOUT - Connection attempt timed out
Error:  Connection timed out
Error:  Failed to retrieve directory listing


Starting with 3.10.0, FileZilla uses FTP over TLS by default. According to FileZilla release notes:

FTP over TLS is now used by default if the server supports it. Use of plain FTP can be enforced for a server in the Site Manager.

Connection fails if FTP over TLS is not accepted by server. Or server is not properly configured for FTP over TLS.


Make sure that server supports FTP over TLS. More information in the documentation.

Additionally firewall and NAT routers the server are behind need to properly configured as well.

Search Words



TLS/TLS-C negotiation failed on control channel



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