windows-itpro-docs/windows/security/operating-system-security/network-security/windows-firewall/configure-rules.md

title, description, ms.topic, ms.date

title	description	ms.topic	ms.date
Configure Firewall rules	Learn how to configure Windows Firewall rules with the CSP and group policy.	conceptual	09/07/2021

Create an inbound ICMP rule

To allow inbound Internet Control Message Protocol (ICMP) network traffic, use the Windows Defender Firewall with Advanced Security node in the Group Policy Management MMC snap-in to create firewall rules. This type of rule allows ICMP requests and responses to be sent and received by computers on the network.

To create an inbound ICMP rule

1. Open the Group Policy Management Console to Windows Defender Firewall with Advanced Security.
2. In the navigation pane, click Inbound Rules.
3. Click Action, and then click New rule.
4. On the Rule Type page of the New Inbound Rule Wizard, click Custom, and then click Next.
5. On the Program page, click All programs, and then click Next.
6. On the Protocol and Ports page, select ICMPv4 or ICMPv6 from the Protocol type list. If you use both IPv4 and IPv6 on your network, you must create a separate ICMP rule for each.
7. Click Customize.
8. In the Customize ICMP Settings dialog box, do one of the following:
   • To allow all ICMP network traffic, click All ICMP types, and then click OK.
   • To select one of the predefined ICMP types, click Specific ICMP types, and then select each type in the list that you want to allow. Click OK.
   • To select an ICMP type that does not appear in the list, click Specific ICMP types, select the Type number from the list, select the Code number from the list, click Add, and then select the newly created entry from the list. Click OK
9. Click Next.
10. On the Scope page, you can specify that the rule applies only to network traffic to or from the IP addresses entered on this page. Configure as appropriate for your design, and then click Next.
11. On the Action page, select Allow the connection, and then click Next.
12. On the Profile page, select the network location types to which this rule applies, and then click Next.
13. On the Name page, type a name and description for your rule, and then click Finish.

Create an inbound port rule

To allow inbound network traffic on only a specified TCP or UDP port number, use the Windows Defender Firewall with Advanced Security node in the Group Policy Management MMC snap-in to create firewall rules. This type of rule allows any program that listens on a specified TCP or UDP port to receive network traffic sent to that port.

To create an inbound port rule

1. Open the Group Policy Management Console to Windows Defender Firewall with Advanced Security.
2. In the navigation pane, click Inbound Rules.
3. Click Action, and then click New rule.
4. On the Rule Type page of the New Inbound Rule Wizard, click Custom, and then click Next.

   Note

   Although you can create rules by selecting Program or Port, those choices limit the number of pages presented by the wizard. If you select Custom, you see all of the pages, and have the most flexibility in creating your rules.

5. On the Program page, click All programs, and then click Next.

   Note

   This type of rule is often combined with a program or service rule. If you combine the rule types, you get a firewall rule that limits traffic to a specified port and allows the traffic only when the specified program is running. The specified program cannot receive network traffic on other ports, and other programs cannot receive network traffic on the specified port. If you choose to do this, follow the steps in the Create an Inbound Program or Service Rule procedure in addition to the steps in this procedure to create a single rule that filters network traffic using both program and port criteria.

6. On the Protocol and Ports page, select the protocol type that you want to allow. To restrict the rule to a specified port number, you must select either TCP or UDP. Because this is an incoming rule, you typically configure only the local port number. If you select another protocol, then only packets whose protocol field in the IP header match this rule are permitted through the firewall.
   To select a protocol by its number, select Custom from the list, and then type the number in the Protocol number box.
   When you have configured the protocols and ports, click Next.
7. On the Scope page, you can specify that the rule applies only to network traffic to or from the IP addresses entered on this page. Configure as appropriate for your design, and then click Next.
8. On the Action page, select Allow the connection, and then click Next.
9. On the Profile page, select the network location types to which this rule applies, and then click Next.

   Note

   If this GPO is targeted at server computers running Windows Server 2008 that never move, consider modifying the rules to apply to all network location type profiles. This prevents an unexpected change in the applied rules if the network location type changes due to the installation of a new network card or the disconnection of an existing network card's cable. A disconnected network card is automatically assigned to the Public network location type.

10. On the Name page, type a name and description for your rule, and then click Finish.

Create an outbound port rule

By default, Windows Firewall allows all outbound network traffic, unless it matches a rule that prohibits the traffic. To block outbound network traffic on a specified TCP or UDP port number, use the Windows Defender Firewall with Advanced Security node in the Group Policy Management console to create firewall rules. This type of rule blocks any outbound network traffic that matches the specified TCP or UDP port numbers.

Note

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 an outbound port rule

1. Open the Group Policy Management Console to Windows Defender Firewall with Advanced Security

2. In the navigation pane, select Outbound Rules

3. Select Action, and then select New rule

4. On the Rule Type page of the New Outbound Rule wizard, select Custom, and then select Next

   Note

   Although you can create rules by selecting Program or Port, those choices limit the number of pages presented by the wizard. If you select Custom, you see all of the pages, and have the most flexibility in creating your rules.

5. On the Program page, select All programs, and then select Next

6. On the Protocol and Ports page, select the protocol type that you want to block. To restrict the rule to a specified port number, you must select either TCP or UDP. Because this rule is an outbound rule, you typically configure only the remote port number

   If you select another protocol, then only packets whose protocol field in the IP header matches this rule are blocked by Windows Defender Firewall. Network traffic for protocols is allowed as long as other rules that match don't block it. To select a protocol by its number, select Custom from the list, and then type the number in the Protocol number box. When you've configured the protocols and ports, select Next,

7. On the Scope page, you can specify that the rule applies only to network traffic to or from the IP addresses entered on this page. Configure as appropriate for your design, and then select Next

8. On the Action page, select Block the connection, and then select Next

9. On the Profile page, select the network location types to which this rule applies, and then select Next

10. On the Name page, type a name and description for your rule, and then select Finish

Create an inbound program or service rule

To allow inbound network traffic to a specified program or service, use the Windows Defender Firewall with Advanced Securitynode in the Group Policy Management MMC snap-in to create firewall rules. This type of rule allows the program to listen and receive inbound network traffic on any port.

Note

This type of rule is often combined with a program or service rule. If you combine the rule types, you get a firewall rule that limits traffic to a specified port and allows the traffic only when the specified program is running. The program cannot receive network traffic on other ports, and other programs cannot receive network traffic on the specified port. To combine the program and port rule types into a single rule, follow the steps in the Create an Inbound Port Rule procedure in addition to the steps in this procedure.

To create an inbound firewall rule for a program or service

1. Open the Group Policy Management Console to Windows Defender Firewall with Advanced Security

2. In the navigation pane, click Inbound Rules

3. Click Action, and then click New rule

4. On the Rule Type page of the New Inbound Rule Wizard, click Custom, and then click Next

   Note

   Information the user should notice even if skimmingAlthough you can create rules by selecting Program or Port, those choices limit the number of pages presented by the wizard. If you select Custom, you see all of the pages, and have the most flexibility in creating your rules.

5. On the Program page, click This program path

6. Type the path to the program in the text box. Use environment variables, where applicable, to ensure that programs installed in different locations on different computers work correctly.

7. Do one of the following:

   • If the executable file contains a single program, click Next.
   • If the executable file is a container for multiple services that must all be allowed to receive inbound network traffic, click Customize, select Apply to services only, click OK, and then click Next.
   • If the executable file is a container for a single service or contains multiple services but the rule only applies to one of them, click Customize, select Apply to this service, and then select the service from the list. If the service does not appear in the list, click Apply to service with this service short name, and then type the short name for the service in the text box. Click OK, and then click Next.

   Important

   To use the Apply to this service or Apply to service with this service short name options, the service must be configured with a security identifier (SID) with a type of RESTRICTED or UNRESTRICTED. To check the SID type of a service, run the following command: sc qsidtype <ServiceName>

   If the result is NONE, then a firewall rule cannot be applied to that service.

   To set a SID type on a service, run the following command: sc sidtype <ServiceName> <Type>

   In the preceding command, the value of <Type> can be UNRESTRICTED or RESTRICTED. Although the command also permits the value of NONE, that setting means the service cannot be used in a firewall rule as described here. By default, most services in Windows are configured as UNRESTRICTED. If you change the SID type to RESTRICTED, the service might fail to start. We recommend that you change the SID type only on services that you want to use in firewall rules, and that you change the SID type to UNRESTRICTED.

8. It is a best practice to restrict the firewall rule for the program to only the ports it needs to operate. On the Protocols and Ports page, you can specify the port numbers for the allowed traffic. If the program tries to listen on a port different from the one specified here, it is blocked. For more information about protocol and port options, see Create an Inbound Port Rule. After you have configured the protocol and port options, click Next

9. On the Scope page, you can specify that the rule applies only to network traffic to or from the IP addresses entered on this page. Configure as appropriate for your design, and then click Next

10. On the Action page, select Allow the connection, and then click Next

11. On the Profile page, select the network location types to which this rule applies, and then click Next

12. On the Name page, type a name and description for your rule, and then click Finish

Create an outbound program or service rule

By default, Windows Defender Firewall allows all outbound network traffic unless it matches a rule that prohibits the traffic. To block outbound network traffic for a specified program or service, use the Windows Defender Firewall with Advanced Security node in the Group Policy Management console to create firewall rules. This type of rule prevents the program from sending any outbound network traffic on any port.

To create an outbound firewall rule for a program or service

1. Open the Group Policy Management Console to Windows Defender Firewall with Advanced Security.

2. In the navigation pane, select Outbound Rules

3. Select Action, and then select New rule

4. On the Rule Type page of the New Outbound Rule Wizard, select Custom, and then select Next

   Note

   Although you can create many rules by selecting Program or Port, those choices limit the number of pages presented by the wizard. If you select Custom, you see all of the pages, and have the most flexibility in creating your rules.

5. On the Program page, select This program path

6. Type the path to the program in the text box. Use environment variables as appropriate to ensure that programs installed in different locations on different computers work correctly

7. Do one of the following:

   • If the executable file contains a single program, select Next
   • If the executable file is a container for multiple services that must all be blocked from sending outbound network traffic, select Customize, select Apply to services only, select OK, and then select Next
   • If the executable file is a container for a single service or contains multiple services but the rule only applies to one of them, select Customize, select Apply to this service, and then select the service from the list. If the service does not appear in the list, then select Apply to service with this service short name, and type the short name for the service in the text box. Select OK, and then select Next

8. If you want the program to be allowed to send on some ports, but blocked from sending on others, then you can restrict the firewall rule to block only the specified ports or protocols. On the Protocols and Ports page, you can specify the port numbers or protocol numbers for the blocked traffic. If the program tries to send to or from a port number different from the one specified here, or by using a protocol number different from the one specified here, then the default outbound firewall behavior allows the traffic. For more information about the protocol and port options, see Create an Outbound Port Rule. When you have configured the protocol and port options, select Next

9. On the Scope page, you can specify that the rule applies only to network traffic to or from the IP addresses entered on this page. Configure as appropriate for your design, and then select Next

10. On the Action page, select Block the connection, and then select Next

11. On the Profile page, select the network location types to which this rule applies, and then select Next

12. On the Name page, type a name and description for your rule, and then select Finish

Create inbound rules to support RPC

To allow inbound remote procedure call (RPC) network traffic, use the Windows Defender Firewall with Advanced Security node in the Group Policy Management console to create two firewall rules. The first rule allows incoming network packets on TCP port 135 to the RPC Endpoint Mapper service. The incoming traffic consists of requests to communicate with a specified network service. The RPC Endpoint Mapper replies with a dynamically assigned port number that the client must use to communicate with the service. The second rule allows the network traffic that is sent to the dynamically assigned port number. Using the two rules configured as described in this topic helps to protect your device by allowing network traffic only from devices that have received RPC dynamic port redirection and to only those TCP port numbers assigned by the RPC Endpoint Mapper.

RPC Endpoint Mapper service

1. Open the Group Policy Management Console to Windows Defender Firewall with Advanced Security.
2. In the navigation pane, click Inbound Rules.
3. Click Action, and then click New rule.
4. On the Rule Type page of the New Inbound Rule Wizard, click Custom, and then click Next.
5. On the Program page, click This Program Path, and then type %systemroot%\system32\svchost.exe.
6. Click Customize.
7. In the Customize Service Settings dialog box, click Apply to this service, select Remote Procedure Call (RPC) with a short name of RpcSs, click OK, and then click Next.
8. On the warning about Windows service-hardening rules, click Yes.
9. On the Protocol and Ports dialog box, for Protocol type, select TCP.
10. For Local port, select RPC Endpoint Mapper, and then click Next.
11. On the Scope page, you can specify that the rule applies only to network traffic to or from the IP addresses entered on this page. Configure as appropriate for your design, and then click Next.
12. On the Action page, select Allow the connection, and then click Next.
13. On the Profile page, select the network location types to which this rule applies, and then click Next.
14. On the Name page, type a name and description for your rule, and then click Finish.

RPC-enabled network services

1. On the same GPO you edited in the preceding procedure, click Action, and then click New rule.
2. On the Rule Type page of the New Inbound Rule Wizard, click Custom, and then click Next.
3. On the Program page, click This Program Path, and then type the path to the executable file that hosts the network service. Click Customize.
4. In the Customize Service Settings dialog box, click Apply to this service, and then select the service that you want to allow. If the service doesn't appear in the list, then click Apply to service with this service short name, and then type the short name of the service in the text box.
5. Click OK, and then click Next.
6. On the Protocol and Ports dialog box, for Protocol type, select TCP.
7. For Local port, select RPC Dynamic Ports, and then click Next.
8. On the Scope page, you can specify that the rule applies only to network traffic to or from the IP addresses entered on this page. Configure as appropriate for your design, and then click Next.
9. On the Action page, select Allow the connection, and then click Next.
10. On the Profile page, select the network location types to which this rule applies, and then click Next.
11. On the Name page, type a name and description for your rule, and then click Finish.