Summary: Clients can access external Web sites through an Internet browser, but they cannot connect to external locations using other Winsock programs. This behavior can occur under the following circumstances:
A computer's access to the Internet is through chained servers that have Microsoft Internet Security and Acceleration (ISA) Server installed.All Internet access for the computer is provided through the upstream server and no direct network connection is available from the downstream clients to the upstream server that has ISA Server installed.
Resolution: Repairing Firewall Clients Are Unable to Use the Upstream Proxy problem can not be that easy. In order to fix your errors and speed up PC, it is recommended that your download the 'Firewall Clients Are Unable to Use the Upstream Proxy Repair Tool'. This is definitely your ideal tool to solve Firewall Clients Are Unable to Use the Upstream Proxy problem in the shortest time.
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To resolve this behavior, you can configure firewall service chaining by performing the following steps:Start the ISA Server Administration tool. On the View menu, click Taskpad.Expand the Server menu items.Click Network Configuration.In the right pane, click Configure Firewall Chaining.
Use the wizard to configure the proper information for the upstream server. The upstream server can be Microsoft Proxy Server version 2.0 or a server with ISA Server installed. The Firewall chaining option makes the server with ISA Server installed act like a firewall client to the upstream server.
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Apart from fixing Firewall Clients Are Unable to Use the Upstream Proxy problems, SmartPCFixer is designed to provide the user's computer system with better optimization, which helps you manage startup items, desktop, browser objects, Internet, system service, Windows optimization, file extensions and so on. With these sophisticated utilities your system is tuned up to run at the optimal state.
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