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When a client computer uses a SOAP Web Services Description Language (WSDL) moniker to activate a COM+ SOAP-enabled server on a computer that is running Windows Vista, server activation fails. Additionally, you receive an error page that resembles the following:

HTTP Error 404.11 - Not Found

Description: The request filtering module is configured to deny a request that contains a double escape sequence.

Error Code: 0×00000000

Notification: BeginRequest

Module: RequestFilteringModule

Requested URL:

Physical Path:

Logon User: Not yet determined

Logon Method: Not yet determined

Handler: HttpRemotingHandlerFactory-rem-Integrated

Most likely causes:

The request contained a double escape sequence and request filtering is configured on the Web server to deny double escape sequences.
What you can try:

Verify the configuration/system.webServer/security/requestFiltering@allowDoubleEscaping setting in the applicationhost.config or web.confg file.

More Information… This is a security feature. Do not change this feature unless the scope of the change is fully understood. You should take a network trace before changing this value to confirm that the request is not malicious. If double escape sequences are allowed by the server, modify the configuration/system.webServer/security/requestFiltering@allowDoubleEscaping setting. This could be caused by a malformed URL sent to the server by a malicious user.

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Server Version Information: Internet Information Services 7.0.

Consider the following scenario. You have Microsoft ASP.NET 1.1 and Microsoft ASP.NET 2.0 installed on a computer that is running Microsoft Windows XP Service Pack 2 (SP2). Then, you upgrade the computer to Windows Vista. In this scenario, you receive the following error message in the Web browser when you visit a Web page:

Server Application Unavailable

The web application you are attempting to access on this web server is currently unavailable. Please hit the “Refresh” button in your web browser to retry your request.

On a Windows Vista-based computer, when you try to copy files from a server on a network, the copy process may stop responding (hang), and you may receive a message that resembles the following:

Calculating Time Remaining

0 minutes remaining

This problem may occur only occasionally.