IIS 5.0: Error message "HTTP/1.1 407 proxy authentication required" (248020)
The information in this article applies to:
- Microsoft Internet Information Services 5.0
This article was previously published under Q248020 SYMPTOMS
When you attempt to connect to a Web site through proxy server, the following error may appear:
HTTP/1.1
407 Proxy Authentication Required
You must authenticate with a proxy server before this request can be
serviced.
Please logon to your proxy server and then try again.
CAUSE
This error is returned when you try to access a Web site through a proxy server that has access control turned on while using Basic Authentication.
The Web Proxy, through a 407 HTTP response, requests credentials from the browser client (or downstream Proxy Server). The client provides the credentials, or in the case of a downstream Web proxy, the proxy server may provide the credentials itself.
If the credentials used by the client or by the downstream proxy server are not allowed by the upstream proxy server, this error will be displayed.
RESOLUTION
This can be resolved by passing the correct credentials to the proxy server. Contact the administrator of the proxy server and verify that the account has permission to use the proxy server.
| Modification Type: | Minor | Last Reviewed: | 2/28/2006 |
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| Keywords: | kbprb kbProd2Web KB248020 |
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