Create an Authentication Exemption List Rule on Windows 7, Windows Vista, Windows Server 2008, and Windows Server 2008 R2
Applies To: Windows 7, Windows Essential Business Server, Windows SBS 2003, Windows SBS 2008, Windows Server 2000, Windows Server 2003, Windows Server 2003 R2, Windows Server 2003 with SP1, Windows Server 2003 with SP2, Windows Server 2008, Windows Server 2008 R2, Windows Vista
In almost any isolated server or isolated domain scenario, there are some computers or devices that cannot communicate by using IPsec. This procedure shows you how to create rules that exempt those computers from the authentication requirements of your isolation policies.
Adding computers to the exemption list for a zone reduces security because it permits computers in the zone to send network traffic that is unprotected by IPsec to the computers on the list. As discussed in the Windows Firewall with Advanced Security Design Guide, you must add only managed and trusted computers to the exemption list.
To complete these procedures, you must be a member of the Domain Administrators group, or otherwise be delegated permissions to modify the GPOs.
To create a rule that exempts specified hosts from authentication
In the navigation pane, click Connection Security Rules.
Click Action, and then click New Rule.
On the Rule Type page of the New Connection Security Rule Wizard, click Authentication exemption, and then click Next.
On the Exempt Computers page, to create a new exemption, click Add. To modify an existing exemption, click it, and then click Edit.
In the IP Address dialog box, do one of the following:
To add a single IP address, click This IP address or subnet, type the IP address of the host in the text box, and then click OK.
To add an entire subnet by address, click This IP address or subnet, and then type the IP address of the subnet, followed by a forward slash (/) and the number of bits in the corresponding subnet mask. For example, 10.50.0.0/16 represents the class B subnet that begins with address 10.50.0.1, and ends with address 10.50.255.254. Click OK when you are finished.
To add the local computer’s subnet, click Predefined set of computers, select Local subnet from the list, and then click OK.
If you select the local subnet from the list rather than typing the subnet address in manually, the computer automatically adjusts the active local subnet to match the computer’s current IP address.
- To add a discrete range of addresses that do not correspond to a subnet, click **This IP address range**, type the beginning and ending IP addresses in the **From** and **To** text boxes, and then click **OK**. - To exempt all of the remote hosts that the local computer uses for a specified network service, click **Predefined set of computers**, select the network service from the list, and then click **OK**.
Repeat steps 5 and 6 for each exemption that you need to create.
Click Next when you have created all of the exemptions.
On the Profile page, check the profile for each network location type to which this set of exemptions applies, and then click Next.
If all of the exemptions are on the organization’s network and that network is managed by an Active Directory domain, then consider restricting the rule to the Domain profile only. Selecting the wrong profile can reduce the protection for your computer because any computer with an IP address that matches an exemption rule will not required to authenticate.
- On the Name page, type the name of the exemption rule, type a description, and then click Finish.
If you arrived at this page by clicking a link in a checklist, use your browser’s Back button to return to the checklist.