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Are you saying your proxy is not on your network? &nbsp;If it is, I wouldn't worry about the .pac file, but routing out the back end of the proxy. &nbsp;If your main connection goes down reroute the backend out the other connection.
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Are you saying your proxy is not on your network?  If it is, I wouldn't worry about the .pac file, but routing out the back end of the proxy.  If your main connection goes down reroute the backend out the other connection.

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We currently are using a proxy and also using a secondary DSL connection for failover. The last piece of the puzzle is a .pac file to use the proxy when connected to the primary connection and go directly out the secondary connection in case the primary connection goes down. I am new to .pac files and have used the ones in the past that call for using a direct connection when the network settings are not detected. This works for my laptop users, the problem I am faced with is these workstaions are always connected to the network so this type of .pac file would not work. So in basic terms I need a .pac file that says if the proxy server is detected or reachable, use it. If not go direct.
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We currently are using a proxy and also using a secondary DSL connection for failover. The last piece of the puzzle is a .pac file to use the proxy when connected to the primary connection and go directly out the secondary connection in case the primary connection goes down. I am new to .pac files and have used the ones in the past that call for using a direct connection when the network settings are not detected. This works for my laptop users, the problem I am faced with is these workstaions are always connected to the network so this type of .pac file would not work. So in basic terms I need a .pac file that says if the proxy server is detected or reachable, use it. If not go direct.

How do I set up a .pac file to use a proxy server and if not available go direct.

Web development includes all aspects of presenting content on intranets and the Internet, including delivery development, protocols, languages and standards, server software, browser clients, databases and multimedia generation.

Web Development

Web browsers are applications used primarily to display documents, files and media from the Internet, identified by a Uniform Resource Identifier (URI) that can be a page, image, video or other file. Some browsers require the use of add-ons or extensions to safely render the information they receive; others have systems built into them to perform the same functions.

Web Browsers

The Internet Protocol (IP) is the principal communications protocol in the Internet protocol suite for relaying datagrams across network boundaries, organized in abstraction layers, traditionally called "Link," "Internet," "Transport" and "Application”. Its routing function enables internetworking, and essentially establishes the Internet. IP defines packet structures that encapsulate the data to be delivered. It also defines addressing methods that are used to label the datagram with source and destination information.