You have finished the creation of the automatic Proxy configuration script. On the domain controller, open the group policy management tool. Right-click your new Group Policy Object and select the Edit option. Access the Connections tab and click on the LAN settings button. The green line allows the configuration of each item. F5 activates all the options on the screen.
F6 activates only the chosen setting. Make sure the configuration you enter has a green line. To save the group policy configuration, you need to close the Group Policy editor. After applying the GPO you need to wait for 10 or 20 minutes. During this time the GPO will be replicated to other domain controllers.
To test the configuration, open the Internet Explorer Proxy configuration. Here is the Proxy configuration screen, before our configuration. Here is the Proxy configuration screen, after our configuration. In our example, the Proxy settings were automatically set using a GPO. Related Posts. January 4th, September 2nd, August 2nd, July 30th, July 29th, July 13th, July 11th, July 10th, July 8th, Choose Disable changing proxy settings from the Administrative Templates setting.
Not Using Active Directory. Skip to main content. This browser is no longer supported. Download Microsoft Edge More info. Contents Exit focus mode. Is this page helpful? Please rate your experience Yes No. Any additional feedback? Important The Internet Explorer 11 desktop application will be retired and go out of support on June 15, In this article.
This is perhaps the biggest drawback to proxy auto-configuration. The best thing about proxy auto-configuration is that it allows administrators to reconfigure the browsers without further intervention from the users.
If the proxy address changes, the administrator simply edits the PAC script to reflect the change. The browsers fetch the PAC URL every time they are started, but apparently not while the browser is running, unless the user forces a reload. Another very nice feature is failure detection, coupled with the ability to specify multiple proxy addresses. If the first proxy in the list is not available, the browser tries the next entry, and so on until the end of the list.
Failure is detected when the browser receives a Connection Refused error or a timeout during connection establishment. The PAC script provides greater flexibility than a manual configuration. As mentioned in Section 2. A proxy auto-configuration script can detect these requests and forward them directly to origin servers. Unfortunately, the auto-configuration script is not given the request method, so we cannot have similar checks for POST and PUT requests, which are also rarely cachable.
The PAC script can also be used creatively to implement load sharing. This results in a somewhat random scheme. There is no guarantee that the same URI always goes to the same proxy cache. If possible, we would rather have requests for the same URIs always going to the same caches, to maximize our hit ratios. We can accomplish this by writing a function that always returns the same proxy list for a given URI.
An example of this is shown later in Example The return string is one or more of the following, separated by semicolons:. The most useful ones are described here. The isPlainHostName host function returns true if host is a single-component hostname rather than a fully qualified domain name. If host contains any periods, this function returns false. Many PAC scripts are written so that requests with plain hostnames are sent directly to the origin server.
Also, the caching proxy may not be able to resolve unqualified hostnames, depending on how the proxy is configured. The dnsDomainIs host , , domain function returns true if host is a member of domain. For example, foo. This function allows the browser, instead of the proxy, to generate error pages for invalid hostnames.
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