Microsoft KB Archive/270471

= ISA Server Unable to Redirect a Request to a URL =

Article ID: 270471

Article Last Modified on 1/15/2006

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APPLIES TO


 * Microsoft Internet Security and Acceleration Server 2000 Standard Edition

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This article was previously published under Q270471



SYMPTOMS
When you are using Internet Security and Acceleration (ISA) Server, if you specify a redirection in the Site and Content rules, when you request a URL, you are unable to locate the site. A repeating loop condition may also occur. For example, if the original destination is  and the redirected destination is , if you try to connect to  , you are redirected to. You are then redirected back to  and a loop occurs.



CAUSE
This condition can occur when you create a Site and Content rule which denies all destinations. If you select the Redirect the request to an alternate URL option, specify the URL and then set it to apply to all requests, the client's browser constantly tries to reach its original destination. The browser is then redirected to the URL that is specified in the rule.



RESOLUTION
To resolve this issue, use either of the following methods:
 * When you select the Redirect the request to an alternate URL option, do not specify a URL to redirect to.

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 * Create a Site and content rule that denies all destinations, except the one you want to redirect to. Also create a Site and Content rule that permits access to the specific destination(s) permitted.



STATUS


MORE INFORMATION
The second rule is necessary because the 'Deny' rule only denies the request, the exception of certain destinations does make this rule process as an &quot;allow&quot; rule. Because ISA implicitly denies all requests that are not explicitly permitted, a permit rule is needed to handle the destinations you want to make accessible and not redirect. See online help for more information about how to create Site and Content rules to deny all sites except a selected destination.

Keywords: kbbug KB270471

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