You can add new lines containing website URLs to your hosts file using such a .bat file: @echo off I am hoping with the address translation from an URL to a host in the hosts file (to a dead address on the network) and then using Windows Defender to block outgoing requests for that dead IP, that combination will result in the firewall just quietly eating the outside connect requests so a) there will be no connections back to my machine in loopback and b) there will be no extra connection requests firing into the local network (because Defender blocked them). Note, do not use the Link Address range (which is used for when a DHCP server is not available and DHCP clients are trying to assign themselves (no central direction) an IP address that does not conflict with another using trial-error-retry with new address approach). Windows Defender Firewall allows you to specify only an IP address or a subnet as a source/destination. Want to experience Microsoft Defender for Endpoint? At one point, Windows Firewall asked if it should allow access to webshots but all that was needed was to click the Allow button. Step 1: Click on the Windows icon on your desktop, and type Windows Defender Firewall in the search box. Certain features might not be supported or might have constrained capabilities. Switch the toggle to On and Save preferences. You can add files to an exclusion list in Defender. Within Windows Defender click “Tools”. $_ -notmatch ([regex]::Escape($Url)) This action will create an audit only policy, to help you understand user behavior before creating a block policy. How to Remove Hidden/Ghost Network Adapters in Windows? Use the time range filter at the top left of the page to select a time period. Configure policies across your device groups to block certain categories. I bet there are apps that you want to block that act both as client and server so looping back forms a connection back to your own machine. Use the expand icon to fully expand each parent category and select specific web content categories. You can stop Windows Defender Antivirus from alerting you or blocking the program by adding the file to the exclusions list. It is better to filter websites on your Internet access router (gateway). There are 3 or 4 ranges with a lot of addresses in them in the list of reserved addresses. } The custom indicator policy will supersede the web content filtering policy when it's applied to the device group in question. Run the Windows Defender Firewall management snap-in (Control Panel\All Control Panel Items\Windows Defender Firewall\Advanced Settings or by running firewall.cpl). Select the categories to block. How to Block Website IP Address in Windows Defender Firewall? Windows Defender Firewall allows you to specify only an IP address or a subnet as a source/destination. Using PowerShell to Create Firewall Rule to Block Website by Domain Name or IP Address. Only devices in the selected device groups will be prevented from accessing websites in the selected categories. (Does not tell you nothing might be there if you do not – machine could be off temporarily or be set not to return ICMP echoes when pinged). Select-String -Pattern ([regex]::Escape($Url)) For more information about browser support, see the prerequisites section. }, Function UnBlockSiteHosts ( [Parameter(Mandatory=$true)]$Url) { You can also subscribe without commenting. Where-Object { Read more about this and other updates here. Just some extra strategies for the thought experiment. Hi Pradhan, If Windows Defender is blocking access to a particular file or folder, it may have detected the file or folder as malicious. Once you confirm the above, set Crowdstrike as the active AV program (via Windows Security Center integration in the CS console). Also, you can block some websites using the built-in Windows Defender Firewall. $hoststr="127.0.0.1 ” + $Url Users won't be blocked from accessing malicious domains It requires enabling Network Protection on the device. Well, I found with some of the google stuff I was trying to block and routed to 127.0.0.1, when I did a netstat -s or netstat -a -n -o, I observed that there were a bunch of connections targeted at the name the google software was looking for that had *CONNECTED* to something on 127.0.0.1 (both the local and foreign addresses were on the loopback interface). I am not monitoring this account anymore. One somewhat useful (depends on how machines on your network setup ping handling) way to test a reserved address on your local net would be to ping it from the command line. Access to Microsoft Defender Security Center portal. The report for this row may not contain an accurate count of devices or access counts. exit. The following message will appear in your browser when trying to connect to the blocked site: In your AD domain you can deploy a Windows Firewall policy to block access to a website on user computers using GPO. In MOST cases, this approach should not impede any local software. Devices running Windows 10 Anniversary Update (version 1607) or later with the latest MoCAMP update. $hosts = 'C:\Windows\System32\drivers\etc\hosts' We will follow whichever region you have elected to use as part of your Microsoft Defender for Endpoint data handling settings. Your data will not leave the data center in that region. The blocking experience for Chrome/Firefox is provided by Network Protection, which provides a system-level toast notifying the user of a blocked connection. Scroll down until you see the entry for Web content filtering. } echo 127.0.0.1 www.facebook.com >> %hostspath% Usually it is located in %windir%\system32\drivers\etc\ directory. FAQ: Live Migration of Virtual Machines with VMWare vMotion, Previous Command History in PowerShell Console, Configuring VLAN Interfaces on Windows 10/Windows Server 2016, Password Change Notification When an AD User Password is About to Expire, Get-ADUser: Getting Active Directory Users Info via PowerShell, Install RSAT Feature on Demand on Windows 10 1809 and Later, Managing Printers and Drivers with PowerShell in Windows 10 / Server 2016, Get-ADComputer: Find Computer Details in Active Directory with PowerShell. In our case, we will try to block certain websites using the built-in Windows 10 tools and PowerShell automation features. You can access the Report details for each card by selecting a table row or colored bar from the chart in the card. Notify me of followup comments via e-mail. Apps, games, and media To restrict access to games, … 2. Network Protection is only supported in Inspect mode on Server devices, which is responsible for securing traffic across Chrome/Firefox. 1. Before trying out this feature, make sure you have the following requirements: If Windows Defender SmartScreen isn't turned on, Network Protection will take over the blocking. It enables your organization to track and regulate access to websites based on their content categories. How to Create a UEFI Bootable USB Drive to Install Windows 10 or 7? Domains: Lists the web domains that have been accessed or blocked in your organization. Web categories: Lists the web content categories that have had access attempts in your organization. If(-not $is_blocked) { In some cases, there are many IPs that lead to URL, in some cases an IP leads to many URLs which may be ones you need or want to get access to. Scroll down until you see the entry for Web content filtering. Malicious - websites that host malware and exploit code; Custom indicator - websites whose URLs or domains you've added to your custom indicator list for blocking; View the domain list. Device groups: Lists all the device groups that have generated web activity in your organization. New-NetFirewallRule -DisplayName "Block Site" -Direction Outbound –LocalPort Any -Protocol Any -Action Block -RemoteAddress $IPAddress. If($is_blocked) { My solution here was to identify a network address locally that DNE and never will (outside my DHCP allocation pool, will not be statically created by me – which also implies that I have entire control over the network which I do) and then use the hosts file to send these requests to a dead end. Also, you can block some websites using the built-in Windows Defender Firewall. Add-Content -Path $hosts -Value $hoststr The report details page for each card contains extensive statistical data about web content categories, website domains, and device groups. You should mention this aspect when you talk about that aspect of things. First of all, you have to get the IP address of the website you want to block. It is possible for you to use one of those ranges to send the requests to (as it isn’t likely to catch a host on your network) and then kill that address with IP based blocking in Defender Firewall. The following cards provide summary information about web content filtering.