Product: Dynamics NAV

Article Link: https://help.truecommerce.com/en/articles/16989074-dynamics-nav-error-could-not-connect-to-ftp-fluentftp-connection-failed

Issue: When attempting to run inbound or outbound file transfers within Dynamics NAV, the system fails to connect to the FTP server and presents a FluentFTP connection failure.

Reason: The FTP connection failure is caused by either the fluentftp.dll file being missing or improperly configured in the standard NAV FTP setup

You can confirm that the TrueCommerce Add-On is utilizing the built-in FTP solution by accessing the FTP Configuration found under the EDI Adminstration settings.

Navigate: Departments → TrueCommerce → EDI (select) → Administration → EDI Setup

Confirm: Use FTP is checked (if not, FTP is disabled)

Confirm: Username/Password

You can perform a quick test to make sure your credentials and NAV client is able to connect to the system within the configuration window

Navigate: Actions → Test FTP URL

As security requirements continue to tighten, it's not uncommon to have common relied upon Ports that allow internet traffic to occur and pass data to be blocked. Check your with your System Administrator or Value-Added Reseller (VAR) on whether or not your environment has blocked ports for FTP (20 & 21 for standard - 22 for SFTP) as this will prevent the TrueCommerce NAV Extension from accessing the FTP.

The TrueCommerce Extension (version 9.00.2.70 and above) requires the FluentFTP.dll file to be installed on your NAV server as a Control Add-In in order to perform FTP calls. If this file is missing, FTP will fail to connect.

Search For: Control Add-Ons

Locate: FluentFTP

If the FluentFTP Add-In is missing, it will need to be reinstalled as a Control Add-In within NAV. For full installation steps, refer to the FTP configuration article linked below.

rev 09/17/26