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PowerShell script to enable TLS 1.2 in preparation for Entra ID Connect, and to disable legacy TLS for Exchange Server 2019.
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| param ( | |
| [switch]$DisableLegacyTls | |
| ) | |
| # Last updated: 2024-02-21 | |
| if($DisableLegacyTls) { | |
| # Disable TLS 1.0 and 1.1 | |
| # Following https://learn.microsoft.com/exchange/plan-and-deploy/post-installation-tasks/security-best-practices/exchange-tls-configuration?view=exchserver-2019&WT.mc_id=M365-MVP-5003086 | |
| # Disable TLS 1.0 | |
| $null = New-Item -Path "HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols" -Name "TLS 1.1" -ErrorAction SilentlyContinue | |
| $null = New-Item -Path "HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.1" -Name "Client" -ErrorAction SilentlyContinue | |
| $null = New-Item -Path "HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.1" -Name "Server" -ErrorAction SilentlyContinue | |
| $null = Set-ItemProperty -Path "HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.1\Client" -Name "DisabledByDefault" -Value 1 -Type DWord | |
| $null = Set-ItemProperty -Path "HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.1\Client" -Name "Enabled" -Value 0 -Type DWord | |
| $null = Set-ItemProperty -Path "HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.1\Server" -Name "DisabledByDefault" -Value 1 -Type DWord | |
| $null = Set-ItemProperty -Path "HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.1\Server" -Name "Enabled" -Value 0 -Type DWord | |
| # Disable TLS 1.1 | |
| $null = New-Item -Path "HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols" -Name "TLS 1.0" -ErrorAction SilentlyContinue | |
| $null = New-Item -Path "HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.0" -Name "Client" -ErrorAction SilentlyContinue | |
| $null = New-Item -Path "HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.0" -Name "Server" -ErrorAction SilentlyContinue | |
| $null = Set-ItemProperty -Path "HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.0\Client" -Name "DisabledByDefault" -Value 1 -Type DWord | |
| $null = Set-ItemProperty -Path "HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.0\Client" -Name "Enabled" -Value 0 -Type DWord | |
| $null = Set-ItemProperty -Path "HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.0\Server" -Name "DisabledByDefault" -Value 1 -Type DWord | |
| $null = Set-ItemProperty -Path "HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.0\Server" -Name "Enabled" -Value 0 -Type DWord | |
| Write-Host 'TLS 1.0 and 1.1 have been disabled.' | |
| } | |
| else { | |
| Write-Host 'Tls 1.0 and 1.1 will NOT be disabled. Use -DisableLegacyTls to disable them.' | |
| } | |
| # Create .NET Framework 2.0/3.5 32-bit hive and enable strong TLS encryption | |
| If (-Not (Test-Path 'HKLM:\SOFTWARE\Wow6432Node\Microsoft\.NETFramework\v2.0.50727')) { | |
| New-Item 'HKLM:\SOFTWARE\Wow6432Node\Microsoft\.NETFramework\v2.0.50727' -Force | Out-Null | |
| } | |
| New-ItemProperty -path 'HKLM:\SOFTWARE\Wow6432Node\Microsoft\.NETFramework\v2.0.50727' -name 'SystemDefaultTlsVersions' -value '1' -PropertyType 'DWord' -Force | Out-Null | |
| New-ItemProperty -path 'HKLM:\SOFTWARE\Wow6432Node\Microsoft\.NETFramework\v2.0.50727' -name 'SchUseStrongCrypto' -value '1' -PropertyType 'DWord' -Force | Out-Null | |
| # Create .NET Framework 2.0/3.5 64-bit hive and enable strong TLS encryption | |
| If (-Not (Test-Path 'HKLM:\SOFTWARE\Microsoft\.NETFramework\v2.0.50727')) { | |
| New-Item 'HKLM:\SOFTWARE\Microsoft\.NETFramework\v2.0.50727' -Force | Out-Null | |
| } | |
| New-ItemProperty -path 'HKLM:\SOFTWARE\Microsoft\.NETFramework\v2.0.50727' -name 'SystemDefaultTlsVersions' -value '1' -PropertyType 'DWord' -Force | Out-Null | |
| New-ItemProperty -path 'HKLM:\SOFTWARE\Microsoft\.NETFramework\v2.0.50727' -name 'SchUseStrongCrypto' -value '1' -PropertyType 'DWord' -Force | Out-Null | |
| # Create .NET Framework 4.0 32-bit hive and enable strong TLS encryption | |
| If (-Not (Test-Path 'HKLM:\SOFTWARE\WOW6432Node\Microsoft\.NETFramework\v4.0.30319')) { | |
| New-Item 'HKLM:\SOFTWARE\WOW6432Node\Microsoft\.NETFramework\v4.0.30319' -Force | Out-Null | |
| } | |
| New-ItemProperty -path 'HKLM:\SOFTWARE\WOW6432Node\Microsoft\.NETFramework\v4.0.30319' -name 'SystemDefaultTlsVersions' -value '1' -PropertyType 'DWord' -Force | Out-Null | |
| New-ItemProperty -path 'HKLM:\SOFTWARE\WOW6432Node\Microsoft\.NETFramework\v4.0.30319' -name 'SchUseStrongCrypto' -value '1' -PropertyType 'DWord' -Force | Out-Null | |
| # Create .NET Framework 4.0 64-bit hive and enable strong TLS encryption | |
| If (-Not (Test-Path 'HKLM:\SOFTWARE\Microsoft\.NETFramework\v4.0.30319')) { | |
| New-Item 'HKLM:\SOFTWARE\Microsoft\.NETFramework\v4.0.30319' -Force | Out-Null | |
| } | |
| New-ItemProperty -path 'HKLM:\SOFTWARE\Microsoft\.NETFramework\v4.0.30319' -name 'SystemDefaultTlsVersions' -value '1' -PropertyType 'DWord' -Force | Out-Null | |
| New-ItemProperty -path 'HKLM:\SOFTWARE\Microsoft\.NETFramework\v4.0.30319' -name 'SchUseStrongCrypto' -value '1' -PropertyType 'DWord' -Force | Out-Null | |
| # Create SCHANNEL Server hive (listenting to TLS connections) and enabled TLS 1.2 | |
| If (-Not (Test-Path 'HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.2\Server')) { | |
| New-Item 'HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.2\Server' -Force | Out-Null | |
| } | |
| New-ItemProperty -path 'HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.2\Server' -name 'Enabled' -value '1' -PropertyType 'DWord' -Force | Out-Null | |
| New-ItemProperty -path 'HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.2\Server' -name 'DisabledByDefault' -value 0 -PropertyType 'DWord' -Force | Out-Null | |
| # Create SCHANNEL Client hive (opening TLS connections) and enabled TLS 1.2 | |
| If (-Not (Test-Path 'HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.2\Client')) { | |
| New-Item 'HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.2\Client' -Force | Out-Null | |
| } | |
| New-ItemProperty -path 'HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.2\Client' -name 'Enabled' -value '1' -PropertyType 'DWord' -Force | Out-Null | |
| New-ItemProperty -path 'HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.2\Client' -name 'DisabledByDefault' -value 0 -PropertyType 'DWord' -Force | Out-Null | |
| Write-Host 'TLS 1.2 has been enabled. The script has not made any changes to the cipher suites.' | |
| write-Host 'Please start the computer.' |
Thanks !
Thanks for sharing!!!
Thansk!
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Thank you very much for this!