Powershell script that blocks the Middle East (ME) OW servers by retrieving the ip ranges from AWS and blocking them for Overwatch, preventing you from having any high ping games. Download the scripts as a zip (top right button), extract it to a folder, right click "block_ME-run_as_admin.bat" and click on "Run as administrator".

block-ME-servers.ps1

#Requires -RunAsAdministrator

param (
    [switch]$remove = $false,                                                      # Use this switch to remove the rules
    [string]$regionPrefix = "me-*",                                                # The prefix of the region we'll be filtering, e.g: me = middle east, us = united states, eu = europe
    [string]$ipRangeRequestUrl = "https://ip-ranges.amazonaws.com/ip-ranges.json", # AWS endpoint that'll give us our IP ranges to block
    [string]$ruleDisplayName = "_OW_BlockMEServers",                               # The name of the firewall rule
    [string]$ruleDescription = "Rule used to block the ME servers for OW"          # The description of the firewall rule
)
                             
Write-Host ""
Write-Host "You can get the latest version of this file from: https://gist.github.com/Giacom/c3bf45d644fdc75fd59552b44f8848b4"
Write-host "Created by /u/Giacomand"
Write-Host ""

if ($remove) {
    try {
        Remove-NetFirewallRule -DisplayName $ruleDisplayName -ErrorAction Stop | Out-Null
        Write-Host "Firewall rules removed, things are back to normal"
    } catch {
        Write-Host "Could not find firewalls rule. Please check Windows Defender Firewall's advanced settings"
    }
    exit
}



Write-Host "Finding Overwatch.exe location.."

$overwatch = Get-ItemProperty "HKLM:\Software\WOW6432Node\Microsoft\Windows\CurrentVersion\Uninstall\Overwatch" -ErrorAction SilentlyContinue
if ($overwatch) {
    $overwatch = $overwatch.InstallLocation + "\_retail_\Overwatch.exe"
    if (Test-Path -Path $overwatch -PathType Leaf) {
        Write-Host "Found at: $overwatch"
    } else {
        $overwatch = ""
        Write-Host "Could not find Overwatch.exe"
    }
} else {
    $overwatch = ""
    Write-Host "Could not find Overwatch.exe"
}

Write-Host ""
Write-Host "Is this the correct location to Overwatch.exe? Leave empty if yes otherwise enter a path"
$corrected = Read-Host "[$overwatch]"
$corrected = $corrected -replace "/","\" # Make sure path separators are the windows standard

if (!([string]::IsNullOrWhiteSpace($corrected))) {
    if (Test-Path -Path $corrected -PathType Leaf) {
        $overwatch = $corrected
    } else {
        Write-Host "Invalid path, please enter the full path to Overwatch.exe!"
        exit
    }
}

if (!(Test-Path -Path $overwatch -PathType Leaf)) {
    Write-Host "Empty or invalid path to Overwatch.exe!"
    exit
} else {
    Write-Host "Using Overwatch.exe location: $overwatch"
}




Write-Host ""
Write-Host "Connecting to $ipRangeRequestUrl to get latest ip ranges..."
$ipAddresses = Invoke-WebRequest -Uri $ipRangeRequestUrl | ConvertFrom-Json | select -expand prefixes | select ip_prefix, region | where {$_.region -Like $regionPrefix}

Write-Host "List of ME Servers retrieved from AWS:"
Format-Wide -InputObject $ipAddresses -AutoSize

$ipAddresses = $ipAddresses | foreach { $_.ip_prefix }

if ($ipAddresses) {

    Write-Host "Deleting any pre-existing Block ME rules from before.."

    Remove-NetFirewallRule -DisplayName $ruleDisplayName -ErrorAction SilentlyContinue | Out-Null

    Write-Host ""
    Write-Host "DONE"
    Write-Host ""

    Write-Host "Adding rules with latest ip ranges.."

    New-NetFirewallRule -DisplayName $ruleDisplayName -Description $ruleDescription -RemoteAddress $ipAddresses -Program $overwatch -Action Block -Direction Inbound -ErrorAction Stop | Out-Null
    New-NetFirewallRule -DisplayName $ruleDisplayName -Description $ruleDescription -RemoteAddress $ipAddresses -Program $overwatch -Action Block -Direction Outbound -ErrorAction Stop | Out-Null

    Write-Host ""
    Write-Host "DONE"
    Write-Host ""
    Write-Host "Rule Name: $ruleDisplayName"
    Write-Host ""

    Write-Host "Firewall update successful! Test if it is working by going to a custom game and trying to connect to"
    Write-Host "a ME region through the custom game lobby settings."
    Write-Host ""
    Write-Host "You can delete/disable these rules if you change your mind, go to advanced settings in Windows Defender Firewall and look for any"
    Write-Host "Inbound and Outbound rules that match the name: $ruleDisplayName"

} else {
    Write-Host "ERROR: Could not retrieve list of ip ranges from AWS, make sure you can connect to $ipRangeRequestUrl"
}

block_ME-run_as_admin.bat

@echo off
echo Run this script as admin, it will add firewall rules to block the ME server
echo Right click on this file -> Run as administrator
echo Alternatively, run a powershell session as admin and run the block-ME-servers.ps1 file

REM change directory to the directory this file is in
cd /D "%~dp0" 

powershell.exe -noprofile -executionpolicy bypass -File block-ME-servers.ps1

echo.
pause

unblock_ME-run_as_admin.bat

@echo off
echo Run this script as admin, it will remove the firewall rules which will unblock the ME server
echo Right click on this file -> Run as administrator
echo Alternatively, run a powershell session as admin and run the block-ME-servers.ps1 with the -remove flag

REM change directory to the directory this file is in
cd /D "%~dp0" 

powershell.exe -noprofile -executionpolicy bypass -File block-ME-servers.ps1 -remove

echo.
pause