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With all these options for defining rules around the Windows Firewall, some defined order must allow them to be evaluated so that it is clear which rules take precedence over other rules Essentially six different types of rules can be defined for the Windows Firewall: Windows Service Hardening Connection Security Rules Authenticated Bypass Rules Restrict specific services from establishing connections Define how and when a computer authenticates using IPSec Allow connections from particular computers that are authenticated via IPSec These connections are allowed regardless of any block rule preventing access Explicitly prevent a type of inbound or outbound traffic Explicitly allow a type of inbound or outbound traffic The general catch-all rule if nothing else applies By default, inbound connections are blocked and outbound connections are allowed
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These rule types are processed in the specific order shown in the table and in Figure 3-19 It s important that you understand this sequence, since you will undoubtedly need it to troubleshoot connectivity problems It s tempting to disable the firewall, especially in a relatively enclosed and secure environment, but it really is a good idea to leave it on and create rules to allow exceptions rather than flat-out disable it and leave your server wide open It might be more aggravating to set up Windows Firewall initially, but in the long run, the added layer of security can help mitigate certain risks You can manage the Windows Firewall using the Windows Firewall with Advanced Security MMC snap-in, which is incorporated into Server Manager, or you can use netsh as you did with the Server Core installation in 2 Certain rules can also be defined using Group Policy For now, let s focus on the MMC snap-in that is available in Server Manager When you click the Windows Firewall with Advanced Security snap-in, a summary pane is displayed in the middle of the Server Manager console, as shown in Figure 3-20 At the top of this pane is an Overview section listing the status of each of the three connection profiles It indicates which profile is active along with the state of the firewall under each profile and whether inbound or outbound connections are allowed or blocked by default To make changes to these connection-based profiles, click the Windows Firewall Properties link at the bottom of the Overview section You will see a tab for each of the connection profiles and an additional tab for IPSec Settings Each of the tabs allows you
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Server Manager
Windows Service Hardening
Connection Security Rules
Authenticated Bypass Rules
Order of Evaluation
Block Rules
Allow Rules
Default Rules
Figure 3-19 Windows Firewall order of processing rules
to change the state of the firewall for that profile If you turn on the firewall, you then have the option of setting the general inbound or outbound connection rules (Figure 3-21) For Inbound Connections, you can select Block (Default), Block All Connections, or Allow (see the following table) For Outbound Connections, you can select Allow (Default) or Block You can also change settings to control the Windows Firewall behavior You can notify the logged on user when inbound connections are blocked, and you can allow unicast responses to multicast or broadcast requests sent out from the server Lastly, you can customize the logging option such as the name of the log file, the size of the log file, and whether to log dropped packets and successful connections State Block Block All Connections Allow Description Blocks connections that don t match any active firewall rules Blocks all inbound connections regardless of firewall rules Allows connections that don t match any active firewall rules
The IPSec Settings tab lets you configure Key Exchange, Data Protection, and Authentication Method settings for IPSec Usually, you will want to keep these at the default settings unless you have very specific requirements for your IPSec environment
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