Article ID: 126809, created on Sep 5, 2015, last review on Sep 5, 2015

  • Applies to:
  • Plesk Automation 11.5

Symptoms

Cannot connect to FTP server using FileZilla 3.10 (or higher) client. 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

or

Status: Insecure server, it does not support FTP over TLS.
Command:    USER user
Error:  Connection timed out after 20 seconds of inactivity
Error:  Could not connect to server
Status: Waiting to retry...

NOTE: The content of error messages might be different depending on the version of FileZilla.

Cause

This issue is related to FileZilla version.

Starting with 3.10.0, FileZilla uses "FTP over TLS" mode 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.

Resolution

In the connection settings of FileZilla (File > Site Manager > Site_Name > Encryption) choose the appropriate mode the FTP server is working in.

Search Words

Failed to retrieve directory listing

TLS/TLS-C negotiation failed on control channel

The data connection could not be established: ETIMEDOUT - Connection attempt timed out

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