Have you ever take a stab at block all Windows 10 processes except one?
If you want to find a way to do this work, this post is what you need.
Get these feasible methods fromMiniTool.

The first solution you might think is to block applications one by one.
The following part will show you how to block all Windows 10 processes except one in detail.
How to Block All Processes Except One in Windows 10?

it’s possible for you to try this method if you like.
Step 1: Press theWindowskey andRkey at the same time to open theRunutility.
Step 2: Typecontrol.exein the dialog box to openControl Panel.

Step 3: ChooseView by: Category.
Step 4: ClickSystem and Security.
Step 5: Under theWindows Defender Firewallpart, clickAllow an app through Windows Firewall.

Step 6: Click theChange settingsbutton and then deselect all processes except one.
Step 7: ClickOKto exit.
Now, test whether you prevent all processes except one in Windows 10.
Step 3: ChooseView by: Small icons.
Step 4: ClickAdministrative Tools.
Step 5: Double-clickWindows Defender Firewall with Advanced Securityto open it.
Step 6: ClickPropertieson the right side.
Step 7: On all profile tabs, chooseBlockfrom the list next toOutbound.
Step 8: ClickApplyand then clickOK.
Step 9: Delete theblock all outgoing trafficrule.
peek if you block all Windows 10 processes except one.
Step 2: ClickFileand then choose theAdd/Remove Snap-in…option.
Step 3: In theAdd or Remove Snap-inswindow, selectIP Security Policy Managementand clickAdd.
Step 4: Select which computer or domain this snap-in will manage, clickFinishand clickOK.
Step 5: SelectIP Security Policies, clickActionand choose theIP Security Policy…option.
Step 7: Click theAdd…button from the pop-up window.
Step 9: Name itBlock Alland click theAdd…button.
Step 11: SelectBlock All, clickNextand then theAdd…button.
Step 13: Repeat Steps 7-12 selecting the proper source, destination or protocol.
After you finish all the steps above, find out if you block all Windows 10 processes except one.
If you want to do this job, try the methods mentioned in this post.