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E System Ei 3102 Drivers. A proxy server handles client requests for resources. A proxy can return a requested resource from its cache or forward the request to the server where the resource resides.

Proxies can improve network performance by reducing the number of requests sent to remote servers. Proxies can also be used to restrict access to resources.

Adaptive Proxies In the.NET Framework, proxies come in two varieties: adaptive and static. Adaptive proxies adjust their settings when the network configuration changes. For example, if a laptop user starts a dialup network connection, an adaptive proxy would recognize this change, discover and run its new configuration script, and adjust its settings appropriately.

Adaptive proxies are configured by a configuration script (see ). The script generates a set of application protocols and a proxy for each protocol. Several options control how the configuration script is run.

You can specify the following: • How often the configuration script is downloaded and run. • How long to wait for the script to download. • Which credentials your system should use to access the proxy. • Which credentials your system should use to download the configuration script. Changes in the network environment may require that the system use a new set of proxies.

If a network connection goes down or a new network connection is initialized, the system must discover the appropriate source of the configuration script in the new environment and run the new script. The following table shows configuration options for an adaptive proxy. Attribute, property, or configuration file setting Description scriptDownloadInterval Elapsed time in seconds between script downloads.

ScriptDownloadTimeout Time to wait (in seconds) for the script to download. UseDefaultCredentials or Controls whether the system uses the default network credentials to access a proxy. UseDefaultCredentialForScriptDownload Controls whether the system uses the default network credentials to download the configuration script. Usesystemdefaults Controls whether the static proxy settings (proxy address, bypass list, and bypass on local) should be read from the Internet Explorer proxy settings for the user. If this value is set to 'true', then the static proxy settings from Internet Explorer will be used. If this value is 'false' or not set, then the static proxy settings can be specified in the configuration and will override the Internet Explorer proxy settings.

This value must also be set to 'false' or not set for adaptive proxies to be enabled. The following example shows a typical adaptive proxy configuration. Static Proxies Static proxies are usually configured explicitly by an application, or when a configuration file is invoked by an application or the system. Static proxies are useful in networks in which the topology changes infrequently, such as a desktop computer connected to a corporate network. Several options control how a static proxy operates. You can specify the following: • The address of the proxy. • Whether the proxy should be bypassed for local addresses.

• Whether the proxy should be bypassed for a set of addresses. The following table shows the configuration options for a static proxy. Attribute, property, or configuration file setting Description proxyaddress or The address of the proxy to use. Bypassonlocal or Controls whether the proxy is bypassed for local addresses. Bypasslist or Describes, with regular expressions, a set of addresses that bypass the proxy. Usesystemdefaults Controls whether the static proxy settings (proxy address, bypass list, and bypass on local) should be read from the Internet Explorer proxy settings for the user. If this value is set to 'true', then the static proxy settings from Internet Explorer will be used.

On.NET Framework 2.0 when this value is set to 'true', the Internet Explorer proxy settings are not overridden by other proxy settings in the configuration file. On.NET Framework 1.1, the Internet Explorer proxy settings can be overridden by other proxy settings in the configuration file. If this value is 'false' or not set, then the static proxy settings can be specified in the configuration and will override the Internet Explorer proxy settings. This value must also be set to 'false' or not set for adaptive proxies to be enabled. The following example shows a typical static proxy configuration.

The Local Intranet Zone and Proxies: The Surprising Connection As of December 2011, this topic has been archived. As a result, it is no longer actively maintained. 120 Tage Sodom Buch Deutsch Pdf.

For more information, see. For information, recommendations, and guidance regarding the current version of Internet Explorer, see.

Eric Lawrence Microsoft Corporation August 19, 2005 Internet Explorer's security model is based around five zones: The Restricted Sites Zone, the Internet Zone, the Local Intranet Zone, the Trusted Sites Zone and the Local Machine Zone. Zones offer a convenient mapping between sites and desired security settings. You can see your current zone settings in Internet Explorer on the Security tab of the Internet Options dialog (which you can access from the Tools menu by clicking Internet Options). Over the past few months, I've seen a number of bug reports observing that the Local Intranet Zone (LIZ) isn't behaving as expected. Sometimes sites (for example, expected to be classified as 'Intranet' are being zoned as 'Internet' sites. Thus certain zone-restricted actions (for example, ActiveX download) are blocked.

Alternatively, some sites (for example, expected to be zoned as 'Internet' sites are being zoned as 'Intranet' sites. While exploring the root cause of this issue, I discovered the sometimes surprising relationship between zones and proxy server configuration.

First, let's look at how a site gets into the LIZ. It is often convenient that TCP/IP allows a server halfway around the world to be accessed as easily as the machine down the hall. On the other hand, the question of what is 'local' is left up to the user or network administrator. It's easy to assume that IE could magically 'know' when a site is on the Local Intranet, but this just isn't so. As in the other security zones, a user can manually add sites to the LIZ using the Sites button on the Security Options dialog. However, the Sites button for the Local Intranet Zone offers options not present for other zones.

Specifically, the following three options are available. • Include all local (intranet) sites not listed in other zones • Include all sites that bypass the proxy server • Include all network paths (UNCs) There's also the Advanced button, which allows you to manually specify sites to be added to the LIZ. • The first option is what we refer to as the 'dot rule.' Basically, it means that a host name which does not contain a period (for example, is zoned in LIZ. Some exceptions exist, for instance, ' format is not permitted by this rule. • The second option is the primary subject of this article, so keep reading.:-) • The third option places files accessed by way of UNC syntax (for example, example) into the LIZ. IP addresses are not permitted, so 207.28.127.1, for instance, is not placed in the LIZ by this rule.

The second option, 'Include all sites that bypass the proxy server,' is deceptively complex. To fully explain it, it's helpful to understand how Internet Explorer gets proxy information.

In Internet Explorer, on the Tools menu, click Internet Options, and then click the Connections tab. If you're connected by way of a LAN connection, click the LAN Settings button, otherwise select your dialup connection and click the Settings button. On the configuration dialog, there are three choices: • Automatically detect settings • Use automatic configuration script • Use a proxy server for your LAN [ or for this connection] Option #3 is the most straightforward—it allows you to manually specify the address and port of a proxy server. If you choose this option and click the Advanced button, you can enter host names that should bypass the proxy under Exceptions.

As you might expect, if you enter exceptions and have configured the Local Intranet Zone option to include 'All sites that bypass the proxy server,' then the host names of those exceptions will be zoned into the LIZ. Options #1 and #2 are closely related and result in Internet Explorer determining its proxy configuration at runtime by way of a script.

The first option uses an called to locate the configuration script, while the second option allows manual entry of the script location. In either case, the script is written in JScript, and provides an implementation of the function FindProxyForURL (in the form: FindProxyForURL(url, host);). This function is called when Internet Explorer is asked to navigate to a URL, and the target URL and host name are passed into the function for evaluation. If the function returns a proxy string (for example, 'MyProxy:80') then the specified proxy is used for the request. Otherwise, if the function returns 'DIRECT' then the origin server is contacted directly, without using a proxy.

And therein was the source of the surprising behavior—when the bugs were filed, the reporter didn't think to check the proxy settings. • In cases where the user was seeing sites (for example, that they expected to be in the LIZ zoned as 'Internet,' they had not configured a proxy server and were accessing the fully-qualified domain name of the server, dots and all. There was no clue to the browser that this was expected to be an 'Intranet' site. • In other cases, users were surprised to see a fully-qualified domain name (for example, zoned into the LIZ because the address contains dots. What they didn't realize is that Internet Explorer was configured to use a PAC script and the proxy-administrator had authored the script to bypass the proxy for any hostname ending in 'example.com.' Hopefully, I've shed some light on the sometimes surprising interactions between zones and proxies.

What other Internet Explorer mysteries have you discovered? I'd like the chance to help get to the bottom of them! Send your ideas to.

Eric Lawrence is a program manager on the Internet Explorer team.