Article ID: 300641 - View products that this article applies to.
This article was previously published under Q300641
This article describes how to enable programs to make a passive CERN FTP connection through Microsoft Internet Security and Acceleration (ISA) Server 2000 or through ISA Server 2004 Standard Edition and ISA Server 2004 (Standard and Enterprise) and ISA Server 2006 (Standard and Enterprise).
(https://support.microsoft.com/kb/322756/ )How to back up and restore the registry in Windows
Programs that must establish a passive CERN FTP connection over an ISA server establish a port-mode connection instead of a PASV-mode connection. You can edit the registry on the ISA server to allow FTP requests that are made by using the Web proxy component to use PASV mode. To do this, follow these steps:
For more information about a problem that you might experience after you enable passive mode FTP through ISA Server 2004, click the following article number to view the article in the Microsoft Knowledge Base:
900256For more information, click the following article number to view the article in the Microsoft Knowledge Base:
(https://support.microsoft.com/kb/900256/ )Error message when ISA Server 2004 Web Proxy client users try to access an external FTP site by using passive FTP functionality: "Error Code: 502 Proxy Error"
300876For additional help and support with ISA Server, visit the following Web sites:
(https://support.microsoft.com/kb/300876/ )How to connect your company to the Internet by using ISA Server 2000 with Windows 2000
http://www.isaserver.org/Note For TMG 2010, the default FTP is already passive. To enable active, you must select an option on the GUI. For more information, see the following TechNet blog entry:
http://blogs.technet.com/yuridiogenes/archive/2010/03/16/error-502-active-ftp-not-allowed-when-trying-to-list-files-in-a-ftp-session-behind-forefront-tmg-2010.aspxMicrosoft provides third-party contact information to help you find technical support. This contact information may change without notice. Microsoft does not guarantee the accuracy of this third-party contact information.
Article ID: 300641 - Last Review: May 24, 2010 - Revision: 8.0