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Internet Explorer Defaults to PASV Mode in Windows XP SP2 and WIndows 2003 SP1  -  KB Article #1428

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Microsoft set the default behavior of Internet Explorer to use PASV mode when connecting to FTP sites in Windows XP Service Pack 2 and Windows 2003 Service Pack 1. If clients running Windows XP are unable to connect using Internet Explorer, please make sure PASV mode is enabled on Serv-U. Our article on configuring Serv-U for PASV mode can be found here.

Internet Explorer’s passive/active FTP behavior can be changed by following the directions below:

  • Open Internet Explorer.
  • Select Tools | Internet Options.
  • Under the Advanced tab, find the option labeled “Use Passive FTP (for firewall and DSL modem compatibility)
  • Check this box to use PASV mode or leave it unchecked to use active FTP

Tools | Internet Options | Advanced |

NOTE: A complete definition of active vs. passive FTP can be found here.