Updated March 31, 2017
This article provides brief information on why users outside your network are unable to view files or folders.
All Serv-U versions
Serv-U and network configurations must both have proper settings for users outside your network to access files and folders.
Timeout is the most common error. This indicates that communication from outside is not reaching Serv-U.
To view files and folders for FTP users, both port 21 and the server's PASV port range must be forwarded to the server.
Note: FTP uses two ports, one for sending commands, and another for sending data.
Download FTP Voyager if the directory listing does not complete, or the FTP Clients in use cannot switch between connection types.
If the connection still fails, attach a copy of the log FTP Voyager creates to a support request and our technicians will help troubleshoot the problem.