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Block Microsoft connectivity check hosts (breaks internet connection status, captive portals)

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Works with Windows 10 and 11Works with Windows Vista, XP, 7, 8, 10, 11, and Windows Server 2008 or newer.
  • Single actionThis page belongs to a script, containing basic changes to achieve a task.
  • Windows onlyThis script improves your privacy on Windows
  • Impact: HighSystem Functionality Loss Risk: High
    This action improves privacy with high impact when you run the recommended script.
  • Batch (batchfile)These changes use Windows system commands to update your settings.
  • 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 connecting to Microsoft connectivity check URLs.

This script enhances your privacy by blocking specific hosts that Microsoft uses to collect your IP address 1.

The blocked hosts are:

  • msftncsi.com 2 3 4
  • www.msftncsi.com 2 5 6 7 8
  • dns.msftncsi.com 2 3 5 7 8 9 10
  • ipv6.msftncsi.com 2 8
  • msftconnecttest.com 2 3 4 9 11
  • www.msftconnecttest.com 2 3 7 9 10 12
  • ipv6.msftconnecttest.com 8 10 11

However, this script may cause several side effects:

  • It disrupts captive portal (hotspot) detection 5 6 13.
  • It impairs functionality of Microsoft software like Azure Backup MARS agent 14 and on-premises data gateway 15.
  • A 'no internet' symbol may appear even when you are connected to the internet 2.

Carefully weigh the privacy benefits against potential functionality issues before applying this script.

Caution

This may lead to:

  • Lack of immediate feedback on network status.
  • Potential functionality issues in the system and applications that rely on NCSI for network information.
  • Reduced ability of Windows and other components to determine internet connectivity.
  • Windows and other software may incorrectly report that you're offline.
  • Issues with automatically opening the sign-in page when a captive portal (hotspot) is detected.
Not Advised

This script should only be used by advanced users.

This script is not recommended for daily use as it breaks important functionality.

Consider creating a system restore point before doing any changes.

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.

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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 Microsoft connectivity check hosts (breaks internet connection status, captive portals)" 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​

Guided, automated application with safety checks
  • Recommended for most users
  • Includes safety checks
  • Free
  • Open-source
  • Popular
  • Offline/Online usage
Open privacy.sexy
Help

How to apply or restore "Block Microsoft connectivity check hosts (breaks internet connection status, captive portals)" 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 Microsoft connectivity check hosts (breaks internet connection status, captive portals)
    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 msftncsi.com
PowerShell -ExecutionPolicy Unrestricted -Command "$domain ='msftncsi.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: $_"^""; continue; }; }"
:: Add hosts entries for dns.msftncsi.com
PowerShell -ExecutionPolicy Unrestricted -Command "$domain ='dns.msftncsi.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: $_"^""; continue; }; }"
:: Add hosts entries for ipv6.msftncsi.com
PowerShell -ExecutionPolicy Unrestricted -Command "$domain ='ipv6.msftncsi.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: $_"^""; continue; }; }"
:: Add hosts entries for msftconnecttest.com
PowerShell -ExecutionPolicy Unrestricted -Command "$domain ='msftconnecttest.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: $_"^""; continue; }; }"
:: Add hosts entries for www.msftconnecttest.com
PowerShell -ExecutionPolicy Unrestricted -Command "$domain ='www.msftconnecttest.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: $_"^""; continue; }; }"
:: Add hosts entries for ipv6.msftconnecttest.com
PowerShell -ExecutionPolicy Unrestricted -Command "$domain ='ipv6.msftconnecttest.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 Microsoft connectivity check hosts (breaks internet connection status, captive portals)" 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​

Wider Goal​

Guides below includes this guide to achieve a wider goal.See other more general settings that includes this one as one of its actions.
These plans combine multiple privacy settings, including this one, for stronger protection.
This category contains scripts that disable various connectivity checks performed by Windows. Connectivity checks allow Windows to assess network status ...

— Disable connectivity checks

Same Goal​

Other guides in Disable connectivity checks See settings that are in the same category as this guide.
Using other actions in the same category may help you achieve your goal better.
Disable active connectivity tests (breaks internet connection status, captive portals)
Disable passive connectivity tests (breaks internet connection status)
Remove "Network Connectivity Status Indicator (NCSI)" app (breaks internet connection status icon)
Disable "Network Location Awareness (NLA)" service (breaks auto-reconnect, connectivity status, network identification)
Disable "Network List Service (NLS)" service (breaks connectivity status, network identification, network connection icon, connectivity with some Microsoft apps)

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
    • Audited and verified using automated security tests

  • Public review by large community​

    • Privacy enthusiasts and professionals peer-reviewed
    • Millions of end-users tested across different environments
    • Audited and verified using third-party security software

History​

We continually monitor our guides, their impact and other potential 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