Specifying an Upstream Proxy

  1. In the Specify upstream proxy section’s IP or FQDN field, type the IP address or the fully qualified domain name of the upstream proxy.
    Note The currently supported upstream proxy configurations are:
    • Squid without user authentication.
    • ISA Server 2004 or 2006 Standard Edition in firewall and proxy mode without user authentication.
    • Forefront TMG 2010 in firewall and proxy mode without user authentication.
    HTTP (port 80) and HTTPS (port 443) traffic will be proxied through the upstream server. You may need to configure your firewall to allow other external connections. Refer to the Setup Guide to review specific ports that the appliance uses for external and internal connections.
  2. In the Specify upstream proxy section’s Port field, type the port number by which you access your organization’s web proxy.
  3. Optionally, to forward requests for specific hostnames to a particular upstream proxy, click the Advanced Settings button.

    The Advanced Settings dialog box is displayed.

    1. In the Hostname text box, enter the IP address or hostname for which you want to forward requests. Wildcard ("*") hostnames can be used, such as *.example.com, if you want to match an entire domain.
    2. In the Upstream proxy text box, enter the hostname or IP address and the colon-separated port number of the upstream proxy to which you want to forward requests.
      Note In Transparent or Bridged mode, if a user requests an HTTPS page from a browser that does not support Server Name Identification (SNI), and you have specified a proxy by hostname or domain in Advanced Settings, that alternative proxy will not be used. Rather, the request will go through the default upstream proxy that you entered in steps 1 and 2. To ensure that the alternative proxy is used instead, enter an IP address in the Advanced Settings.
    3. Click Add to add the new entry to the list.
    4. To remove entries from the list, first select the check box next to each entry that you want to remove, then click Delete.
  4. Click Apply.