Point browser to local pac file

Can be used to specify different proxies for a specific time range. The function dnsResolve and similar other functions performs a DNS lookup that can block your browser for a long time if the DNS server does not respond. If you cache proxy auto-configuration results by domain name in your browser such as Microsoft's Internet Explorer 5.

Alternatively, you can disable caching of proxy auto-configuration results by editing the registry. It is recommended to always use IP addresses instead of host domain names in the isInNet function for compatibility with other Windows components that make use of the Internet Explorer PAC settings, such as.

NET 2. For example,. The current convention is to fail over to the direct connection when a PAC file is unavailable. When switching quickly between network configurations for example, when entering or leaving a VPN , dnsResolve may give outdated results due to DNS caching. For instance, Firefox usually keeps 20 domain entries cached for 60 seconds. This may be configured via the network. Flushing the system's dns cache may also help, such as by using the sudo service dns-clean start in Linux.

The myIpAddress function has often been reported to give wrong or unusable results for example, Also, when the browser is Firefox 3 or higher, and the operating system has IPv6 enabled, which is the default in Windows 7 and Vista, the myIpAddress function returns the IPv6 address, which is not usually expected nor programed for in the PAC file. For a discussion of solutions, see this Mozilla forum discussion. Further limitations are related to the JavaScript engine on the local machine.

Please review the Java open issues in the release notes for the versions of Java used by your client browsers. This makes it much more challenging for administrators to control the configuration and use of alternate browser Firefox 3 offered a GPO add-on, but Firefox 3 is long gone. Search the Internet for tools and strategies available for your organization's chosen browser.

In addition to controlling which browsers are allowed and managing their configuration, it is essential that proper firewall policy is in place. Not an IT pro? Internet Explorer TechCenter.

Sign in. United States English. Ask a question. Quick access. Search related threads. Here, xxxxxx is a unique identifier for your policy. You should use the policy-specific PAC file in the following circumstances:. You cannot use a proxied connection on your policies. You do not need to use a policy-specific URL when connecting from an IP address configured as a proxied connection in a policy, since the policy-specific PAC file is automatically served.

A remote user needs to access bypass destinations specified in the policy-specific PAC file, but is able to access these destinations directly, for example, via a VPN client. In this case, use the alternate PAC file address listed on the policy's General tab. Remote users should also use the alternate policy-specific PAC file address if requesting access from a network that has port locked down.

Even if they can access the PAC file on port or , port is the standard required port to be able to use the cloud service. The policy-specific PAC file allows remote users to always use the correct PAC file for their policy, although this is not always appropriate, because bypass destinations may not be relevant for the remote users' locations. When I tried to research it online, there was a lot of conflicting advice about:. I tried different combinations of the above, but requests from Chrome never went through the proxy when I monitored the proxy's log.

While crbug. Thanks for that! However, it also lists my proxy as bad and that it will retry it at a timestamp about five minutes in the future.