A Web proxy server intercepts HTTP requests and determines if it has stored copies of the requested Web pages. If it does not, the proxy completes the request to the server on the Internet, returning the requested information to the user and also saving it locally for future requests. Setting up a Web proxy server on a network can be cumbersome, because each computer on the network must be configured to direct Web requests to the server.
If you have a proxy server on your network, instead of configuring each computer’s Web browser to point to the proxy server, you can move the server to the WAN or DMZ and enable Web Proxy Forwarding using the settings on the Network > Web Proxy page. The SonicWALL security appliance automatically forwards all Web proxy requests to the proxy server without requiring all the computers on the network to be configured.
To configure a Proxy Web sever, select the Network > Web Proxy page.
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Step 1
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Connect your Web proxy server to a hub, and connect the hub to the SonicWALL security
appliance WAN or DMZ port.
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Step 2
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Step 3
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Type the proxy IP port in the
Proxy Web Server Port
field.
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Step 4
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To bypass the Proxy Servers if a failure occurs, select the
Bypass Proxy Servers Upon Proxy
Server Failure
check box.
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Step 5
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Select
Forward DMZ Client Requests to Proxy Server
if you have clients configured on the DMZ.
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Step 6
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Click
Accept
. Once the SonicWALL security appliance has been updated, a message confirming the update is displayed at the bottom of the browser window.
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If a Web proxy server is specified on the Firewall > Web Proxy page, selecting the Bypass Proxy Servers Upon Proxy Server Failure check box allows clients behind the SonicWALL security appliance to bypass the Web proxy server in the event it becomes unavailable. Instead, the client’s browser accesses the Internet directly as if a Web proxy server is not specified.