Restrict Server Access to Members of a Group Only
After you have configured the IPsec connection security rules that force client devices to authenticate their connections to the isolated server, you must configure the rules that restrict access to only those devices or users who have been identified through the authentication process as members of the isolated server’s access group.
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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 firewall rule that grants access to an isolated server
Open the Group Policy Management Console to Windows Defender Firewall with Advanced Security. You must edit the GPO that applies settings to servers in the isolated server zone.
In the navigation pane, right-click Inbound Rules, and then click New Rule.
On the Rule Type page, click Custom, and then click Next.
If you must restrict access to a single network program, then you can select This program path, and specify the program or service to which to grant access. Otherwise, click All programs, and then click Next.
If you must restrict access to only some TCP or UDP port numbers, then enter the port numbers on the Protocol and Ports page. Otherwise, set Protocol type to Any, and then click Next.
On the Scope page, select Any IP address for both local and remote addresses, and then click Next.
On the Action page, click Allow the connection if it is secure. If required by your design, you can also click Customize and select Require the connections to be encrypted. Click Next.
On the Users and Computers page, select the check box for the type of accounts (computer or user) you want to allow, click Add, and then enter the group account that contains the device and user accounts permitted to access the server.
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