![]() ![]() ![]() We’ve seen that this is sometimes caused by Antivirus and Antispyware tools that acts as a second layer of firewall. So, many users try to turn off their PC firewall, but still face issues. “ This means that some router and/or firewall is still interfering with Filezilla.” The FileZilla error 503 failure of data connection goes on to state: Blocked by firewall or antivirus software To set it in FileZilla, go to File > Site Manager > Encryption > Only use plain FTP(insecure).ģ. To fix this we recommend customers to use the basic FTP protocol. When users attempt to connect to an unsupported port, the server firewall will block that connection, and it’ll result in the error 503 failure of data connection. We’ve seen users mixing up these two, or even trying to establish a SSL/TLS connection where no such facility exists. Similarly, some hosts offer FTP over SSL that uses port 990. It uses port 22 instead of the traditional FTP port 21. We recommend this to be set by default for all FTP accounts.Ģ. To solve this, we help the users navigate the settings and choose Passive mode. We’ve seen cases where FTP users accidentally set their FTP mode to Active, causing the connection to fail. Such an incoming connection closely resembles a cyber attack, and most firewalls block such non-standard connections. To use Active FTP, users must configure their PCs to allow incoming connections FROM the server to a non-standard port (Port 21 is the standard FTP port. Here are the top 5 causes we’ve seen for this error, and how we fix them.įTP transfers can happen in Active or Passive mode. It could be in the user’s PC, the modem, within the office network, ISP, or the server. This error says that the FTP client was unable to contact the server’s FTP port, which means that the connection was blocked somewhere along the way. What is “503 failure of data connection”? Here at, we help Web hosts, VPS users and website users troubleshoot such errors as part of our Outsourced Hosting Support services.ĥ03 failure of data connection is a common error seen in FileZilla FTP client. You know that the connection has failed (obviously!), but where? Response: 503 Failure of data connection. Errors can be frustrating, especially if they are cryptic, like this: Response: 150 opening data connection ![]()
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