Article ID: 823261 - View products that this article applies to.
When you try to connect to a FTP server through an ISA Server 2000 Web proxy service, you may receive the following error message:
This problem may occur if all the following conditions are met:
HTTP 502 Proxy Error - The user name was not allowed. Try a different name, or retry the same name after verifying that it is typed correctly. (12013)
The ISA Server Web proxy service always expects to be prompted for a password after it sends the USER command to the FTP server. The FTP server prompts for a password by responding with a 331 response code. If the FTP server instead responds with 230 ("User logged in, proceed"), ISA Server misinterprets the results, and you receive the error message that is described in the "Symptoms" section.
A supported hotfix is available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing this specific problem. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next software update that contains this hotfix.
If the hotfix is available for download, there is a "Hotfix download available" section at the top of this Knowledge Base article. If this section does not appear, contact Microsoft Customer Service and Support to obtain the hotfix.
Note If additional issues occur or if any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft Web site:
Date Time Version Size File name ------------------------------------------------------ 22-June-2003 12:54 3.0.1200.278 30,992 W3pinet.dll
PrerequisitesISA Server 2000 Service Pack 1 (SP1) is required to install this hotfix. For additional information about how to obtain ISA Server Service Pack 1, click the following article number to view the article in the Microsoft Knowledge Base:
(http://support.microsoft.com/kb/313139/EN-US/ )How to Obtain the Latest Internet Security and Acceleration Server 2000 Service Pack
Hotfix Replacement InformationThis hotfix does not replace any other hotfixes.
FTP servers may be configured to return 230 instead of the more typical 331 immediately after the server receives the USER command. Because a 230 response code translates to "User logged in, proceed", no PASS command is required. The hotfix changes the behavior of the ISA Server 2000 Web Proxy service to recognize the 230 response code as valid, and therefore the end of the authentication phase. For more information, see the FTP RFC (959).
To configure Redirect HTTP requests as FTP requests on the Web publishing rule:
Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article.
Article ID: 823261 - Last Review: June 14, 2007 - Revision: 1.7