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Home > Success Center > Serv-U Managed File Transfer & Serv-U FTP Server > Passive mode fails through a SonicWall

Passive mode fails through a SonicWall

Updated May 2, 2017


This article provides a workaround for the issue where connecting to Serv-U through a SonicWall using PASV mode fails.


All Serv-U versions


The issue is caused when the Serv-U Listener has a specified PASV IP address and the Network Address Translation (NAT) is enabled for SonicWall.


As a workaround, do NOT specify an IP address for the PASV IP address or Domain Name fields in the Serv-U Listener.




Last modified
01:28, 2 May 2017