This article describes how to delete the Windows Communication Foundation (WCF) URL reservation in Windows Server 2008 or in Windows Vista. This article also describes how to re-create the reservation by using a discretionary access control list (DACL).
The concept of the URL reservation for shared listeners was introduced to restrict the number of users who can receive messages on each part of the HTTP namespace. A reservation consists of the following elements:
A URL template on which the reservation applies
A DACL to restrict the number of users
Flags that indicate whether the reservation is for permission to listen or to delegate control of the namespace
A shared HTTP listener can be started only if there is a DACL on that address that enables the listening process. The lack of a reservation denies access to everyone.
As part of the default operating system configuration, WCF creates a globally available reservation for port 80. This reservation enables all users to write applications that can use dual HTTP binding for duplex communication. However, because the DACL on this reservation applies to everyone, the administrator cannot explicitly enable or disable access to the WCF listener URL.
Note In Windows Server 2008 or in Windows Vista, you can view all the HTTP URL reservations in a Command Prompt window. To do this, type the following command at the command prompt:
netsh http show urlacl
Note You must be an administrator to perform the following procedures.
Delete the WCF URL reservation
To delete the WCF URL reservation, follow these steps:
Click Start , point to All Programs, click Accessories, right-click Command Prompt, and then click Run as Administrator.
If you are prompted for an administrator password or for confirmation, type the password or provide confirmation.
At the command prompt, type the following command:
Windows Server 2008 Standard, Windows Server 2008 Datacenter, Windows Server 2008 Enterprise, Windows Vista Home Basic, Windows Vista Home Premium, Windows Vista Business, Windows Vista Enterprise, Windows Vista Ultimate