FIX: SecureNAT clients receive a "404 Page Cannot Be Found" error page when the clients try to access the Internet through a Threat Management Gateway 2010 server

Consider the following scenario:

• You have a server that is running Microsoft Forefront Threat Management Gateway (TMG) 2010.
• The TMG 2010 server is either the default gateway or on the network route to the Internet.
• Client computers use SecureNAT clients to access the Internet.

In this scenario, the SecureNAT clients receive "404 Page Cannot be Found" error pages when the clients try to access the Internet. These error pages originate from a web server that is a different web server than the one that the SecureNAT client was trying to access. For example, a SecureNAT client that browses to http://www.contoso.com may receive a 404 error page from an http://www.woodgrovebank.com web server.