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Block Windows crash report hosts

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Works with Windows 10 and 11Works with Windows Vista, XP, 7, 8, 10, 11, and Windows Server 2008 or newer.
  • Windows onlyThis script improves your privacy on Windows
  • Single actionThis page belongs to a script, containing basic changes to achieve a task.
  • Impact: Minimum

    System Functionality / Data Loss Risk: Low

    This action improves privacy with minimal impact when you run the recommended script.

  • Batch (batchfile)These changes use Windows system commands to update your settings.
  • Administrator rights requiredThis script requires privilege access to do the system changes
  • Fully reversible

    You can fully restore this action (revert back to the original behavior) using this website.

    The restore/revert methods provided here can help you fix issues.

Overview​

This script prevents Windows from sending crash reports to Microsoft, enhancing your privacy.

Windows Error Reporting (WER) creates minidumps (small memory snapshots at crash time) and sends them to Microsoft 1.

Although intended to improve software by analyzing crash data, this feature raises privacy concerns such as:

  • Inclusion of sensitive information within the dumps, such as personal data and passwords 2 3.
  • Data sharing with Microsoft and other third parties through the Windows Desktop Application Program 1.

To safeguard your privacy, this script blocks specific hosts that Windows uses to transmit crash data, ensuring these minidump files remain on your local machine and are not sent to Microsoft or its partners.

The blocked hosts are:

  • oca.telemetry.microsoft.com 4
  • oca.microsoft.com 4
  • kmwatsonc.events.data.microsoft.com 4
Safe for General Use
All actions in this script is recommended for all users. This is recommended for all users to improve without any noticeable impact on the system functionality.
Sources
PrivacyLearn.com maintains strict sourcing standards for accuracy, integrity and up-to-date content. Our content relies on authoritative sources including vendor documentation, industry standards, and verified research. Learn more about our verification process and quality standards in our editorial standards page.

Apply Now​

Choose one of three ways to apply:

Download script​

Download and run the script directly
  • No app needed
  • Offline usage
  • Easy-to-apply
  • Free
  • Open-source
Help

How to apply or restore "Block Windows crash report hosts" using script​

  • ≈ 2 min to complete
  • Tools: Web Browser
  • Difficulty: Simple
  • ≈ 5 instructions
  1. 1

    Download

    Download the script file by clicking on the   Apply protection  button above.
    Use   Undo protection button above to restore changes.
  2. 2

    Keep the file

    If warned by your browser, keep the file.
  3. 3

    Open

    Open the downloaded file.
  4. 4

    Exit

    Once it's done, press any key to exit the window.
  5. 5

    Restart

    Restart your computer for all changes to take effect.

Apply with privacy.sexy​

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  • Recommended for most users
  • Includes safety checks
  • Free
  • Open-source
  • Popular
  • Offline/Online usage
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Help

How to apply or restore "Block Windows crash report hosts" using privacy.sexy​

  • ≈ 3 min to complete
  • Tools: privacy.sexy
  • Difficulty: Simple
  • ≈ 4 instructions
privacy.sexy is free and open-source application that lets securely apply this action easily with more advanced options.
  1. 1

    Open or download

    Open or download the desktop application
  2. 2

    Choose script

    1. Search for the script name: Block Windows crash report hosts
    2. Check the script by clicking on the checkbox.
  3. 3

    Run

    Click on ▶️ Run button at the bottom of the page.

    This button only appears on desktop version (recommended). On browser, use 💾 Save button.

Run commands​

Copy and run commands manually Requires technical knowledge
Apply changes
:: Add hosts entries for oca.telemetry.microsoft.com
PowerShell -ExecutionPolicy Unrestricted -Command "$domain ='oca.telemetry.microsoft.com'; $hostsFilePath = "^""$env:SYSTEMROOT\System32\drivers\etc\hosts"^""; $comment = "^""managed by privacy.sexy"^""; $hostsFileEncoding = [Microsoft.PowerShell.Commands.FileSystemCmdletProviderEncoding]::Utf8; $blockingHostsEntries = @(; @{ AddressType = "^""IPv4"^"";  IPAddress = '0.0.0.0'; }; @{ AddressType = "^""IPv6"^"";  IPAddress = '::1'; }; ); try { $isHostsFilePresent = Test-Path -Path $hostsFilePath -PathType Leaf -ErrorAction Stop; } catch { Write-Error "^""Failed to check hosts file existence. Error: $_"^""; exit 1; }; if (-Not $isHostsFilePresent) { Write-Output "^""Creating a new hosts file at $hostsFilePath."^""; try { New-Item -Path $hostsFilePath -ItemType File -Force -ErrorAction Stop | Out-Null; Write-Output "^""Successfully created the hosts file."^""; } catch { Write-Error "^""Failed to create the hosts file. Error: $_"^""; exit 1; }; }; foreach ($blockingEntry in $blockingHostsEntries) { Write-Output "^""Processing addition for $($blockingEntry.AddressType) entry."^""; try { $hostsFileContents = Get-Content -Path "^""$hostsFilePath"^"" -Raw -Encoding $hostsFileEncoding -ErrorAction Stop; } catch { Write-Error "^""Failed to read the hosts file. Error: $_"^""; continue; }; $hostsEntryLine = "^""$($blockingEntry.IPAddress)`t$domain $([char]35) $comment"^""; if ((-Not [String]::IsNullOrWhiteSpace($hostsFileContents)) -And ($hostsFileContents.Contains($hostsEntryLine))) { Write-Output 'Skipping, entry already exists.'; continue; }; try { Add-Content -Path $hostsFilePath -Value $hostsEntryLine -Encoding $hostsFileEncoding -ErrorAction Stop; Write-Output 'Successfully added the entry.'; } catch { Write-Error "^""Failed to add the entry. Error: $_"^""; continue; }; }"
:: Add hosts entries for oca.microsoft.com
PowerShell -ExecutionPolicy Unrestricted -Command "$domain ='oca.microsoft.com'; $hostsFilePath = "^""$env:SYSTEMROOT\System32\drivers\etc\hosts"^""; $comment = "^""managed by privacy.sexy"^""; $hostsFileEncoding = [Microsoft.PowerShell.Commands.FileSystemCmdletProviderEncoding]::Utf8; $blockingHostsEntries = @(; @{ AddressType = "^""IPv4"^"";  IPAddress = '0.0.0.0'; }; @{ AddressType = "^""IPv6"^"";  IPAddress = '::1'; }; ); try { $isHostsFilePresent = Test-Path -Path $hostsFilePath -PathType Leaf -ErrorAction Stop; } catch { Write-Error "^""Failed to check hosts file existence. Error: $_"^""; exit 1; }; if (-Not $isHostsFilePresent) { Write-Output "^""Creating a new hosts file at $hostsFilePath."^""; try { New-Item -Path $hostsFilePath -ItemType File -Force -ErrorAction Stop | Out-Null; Write-Output "^""Successfully created the hosts file."^""; } catch { Write-Error "^""Failed to create the hosts file. Error: $_"^""; exit 1; }; }; foreach ($blockingEntry in $blockingHostsEntries) { Write-Output "^""Processing addition for $($blockingEntry.AddressType) entry."^""; try { $hostsFileContents = Get-Content -Path "^""$hostsFilePath"^"" -Raw -Encoding $hostsFileEncoding -ErrorAction Stop; } catch { Write-Error "^""Failed to read the hosts file. Error: $_"^""; continue; }; $hostsEntryLine = "^""$($blockingEntry.IPAddress)`t$domain $([char]35) $comment"^""; if ((-Not [String]::IsNullOrWhiteSpace($hostsFileContents)) -And ($hostsFileContents.Contains($hostsEntryLine))) { Write-Output 'Skipping, entry already exists.'; continue; }; try { Add-Content -Path $hostsFilePath -Value $hostsEntryLine -Encoding $hostsFileEncoding -ErrorAction Stop; Write-Output 'Successfully added the entry.'; } catch { Write-Error "^""Failed to add the entry. Error: $_"^""; continue; }; }"
:: Add hosts entries for kmwatsonc.events.data.microsoft.com
PowerShell -ExecutionPolicy Unrestricted -Command "$domain ='kmwatsonc.events.data.microsoft.com'; $hostsFilePath = "^""$env:SYSTEMROOT\System32\drivers\etc\hosts"^""; $comment = "^""managed by privacy.sexy"^""; $hostsFileEncoding = [Microsoft.PowerShell.Commands.FileSystemCmdletProviderEncoding]::Utf8; $blockingHostsEntries = @(; @{ AddressType = "^""IPv4"^"";  IPAddress = '0.0.0.0'; }; @{ AddressType = "^""IPv6"^"";  IPAddress = '::1'; }; ); try { $isHostsFilePresent = Test-Path -Path $hostsFilePath -PathType Leaf -ErrorAction Stop; } catch { Write-Error "^""Failed to check hosts file existence. Error: $_"^""; exit 1; }; if (-Not $isHostsFilePresent) { Write-Output "^""Creating a new hosts file at $hostsFilePath."^""; try { New-Item -Path $hostsFilePath -ItemType File -Force -ErrorAction Stop | Out-Null; Write-Output "^""Successfully created the hosts file."^""; } catch { Write-Error "^""Failed to create the hosts file. Error: $_"^""; exit 1; }; }; foreach ($blockingEntry in $blockingHostsEntries) { Write-Output "^""Processing addition for $($blockingEntry.AddressType) entry."^""; try { $hostsFileContents = Get-Content -Path "^""$hostsFilePath"^"" -Raw -Encoding $hostsFileEncoding -ErrorAction Stop; } catch { Write-Error "^""Failed to read the hosts file. Error: $_"^""; continue; }; $hostsEntryLine = "^""$($blockingEntry.IPAddress)`t$domain $([char]35) $comment"^""; if ((-Not [String]::IsNullOrWhiteSpace($hostsFileContents)) -And ($hostsFileContents.Contains($hostsEntryLine))) { Write-Output 'Skipping, entry already exists.'; continue; }; try { Add-Content -Path $hostsFilePath -Value $hostsEntryLine -Encoding $hostsFileEncoding -ErrorAction Stop; Write-Output 'Successfully added the entry.'; } catch { Write-Error "^""Failed to add the entry. Error: $_"^""; continue; }; }"
Help

How to apply or restore "Block Windows crash report hosts" using commands​

  • ≈ 2 min to complete
  • Tools: Command Prompt
  • Difficulty: Medium
  • ≈ 3 instructions
 View step-by-step guide with screenshots
  1. 1

    Open Command Prompt

    Open Command Prompt as Administrator.
  2. 2

    Copy code

    Copy the code:
    Copy Apply Code Copy Revert Code
  3. 3

    Paste & run

    Paste the commands into Command Prompt and press Enter to run.

    Some changes require a system restart to take effect

Similar Guides​

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The guide below includes this guide to achieve a wider goal.

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— Block tracking hosts

Same Goal​

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About the Creators​

These people have authored this documentation and written its scripts:

  • Avatar of undergroundwires. The creator of PrivacyLearn and privacy.sexy. Black and white portrait showing a person wearing a polka dot tie and suit jacket, reflecting the professional expertise behind the privacy protection tools.
    • Certified security professional
    • 7+ years experience securing banks
    • Open-source developer since 2005
    • EU advisor, Public Speaker, Moderator
    • Hundreds across the globe
    • Testers, reviewers, developers
    • Companies, military agencies
    • Community since 2017
About Us

Reviewed By​

This guide has undergone comprehensive auditing and peer review:

  • Expert review by undergroundwires​

    • Verified technical accuracy and editorial standards
    • Assessed system impact and user privacy risks

  • Public review by large community​

    • Privacy enthusiasts and professionals peer-reviewed
    • Millions of end-users tested across different environments

History​

We continually monitor our guides, their impact and all other privacy options. We update our guides when new information becomes available. On every update, we publicly store who made the change, what has been changed, why the change was made and when the change was made.

Review Change History Our Change Process