Power BI Refresh Error:
FtpFailedToConnectToFtpServer

What does this error mean?

ADF or Fabric could not connect to the FTP server. Most common cause: using the SFTP connection type instead of FTP, or port 21 being blocked.

Common causes

• 1An incorrect Connection type is used — for example, using the SFTP (Secure FTP) connection type to connect to a plain FTP server
• 2The FTP server port is wrong — FTP uses port 21 by default

How to fix it

1. 1Verify you are using the FTP connection type in your linked service, not SFTP
2. 2Check the port of the target server — FTP uses port 21 by default
3. 3If the server requires passive mode data transfer, ensure the firewall allows ports 1024–65535 from the integration runtime IP

Other data source errors