Applies to: Configuration Manager (Current Branch)
When enabling TLS 1.2 for your Configuration Manager environment, start by ensuring the clients are capable and properly configured to use TLS 1.2 before enabling TLS 1.2 and disabling the older protocols on the site servers and remote site systems. There are three tasks for enabling TLS 1.2 on clients:
Update Windows and WinHTTP
Ensure that TLS 1.2 is enabled as a protocol for SChannel at the operating system level
Update and configure the .NET Framework to support TLS 1.2
For more information about dependencies for specific Configuration Manager features and scenarios, see About enabling TLS 1.2.
Update Windows and WinHTTP
Windows 8.1, Windows Server 2012 R2, Windows 10, Windows Server 2016, and later versions of Windows natively support TLS 1.2 for client-server communications over WinHTTP.
Earlier versions of Windows, such as Windows 7 or Windows Server 2012, don't enable TLS 1.1 or TLS 1.2 by default for secure communications using WinHTTP. For these earlier versions of Windows, install Update 3140245 to enable the registry value below, which can be set to add TLS 1.1 and TLS 1.2 to the default secure protocols list for WinHTTP. With the patch installed, create the following registry values:
Important
Enable these settings on all clients running earlier versions of Windows before enabling TLS 1.2 and disabling the older protocols on the Configuration Manager servers. Otherwise, you can inadvertently orphan them.
The example above shows the value of 0xAA0 for the WinHTTP DefaultSecureProtocols setting. Update to enable TLS 1.1 and TLS 1.2 as default secure protocols in WinHTTP in Windows lists the hexadecimal value for each protocol. By default in Windows, this value is 0x0A0 to enable SSL 3.0 and TLS 1.0 for WinHTTP. The above example keeps these defaults, and also enables TLS 1.1 and TLS 1.2 for WinHTTP. This configuration ensures that the change doesn't break any other application that might still rely on SSL 3.0 or TLS 1.0. You can use the value of 0xA00 to only enable TLS 1.1 and TLS 1.2. Configuration Manager supports the most secure protocol that Windows negotiates between both devices.
Ensure that TLS 1.2 is enabled as a protocol for SChannel at the operating system level
For the most part, protocol usage is controlled at three levels, the operating system level, the framework or platform level, and the application level. TLS 1.2 is enabled by default at the operating system level. Once you ensure that the .NET registry values are set to enable TLS 1.2 and verify the environment is properly utilizing TLS 1.2 on the network, you may want to edit the SChannel\Protocols registry key to disable the older, less secure protocols. For more information on disabling TLS 1.0 and 1.1, see Configuring Schannel protocols in the Windows Registry.
Update and configure the .NET Framework to support TLS 1.2
Install the .NET updates so you can enable strong cryptography. Some versions of .NET Framework might require updates to enable strong cryptography. Use these guidelines:
NET Framework 4.6.2 and later supports TLS 1.1 and TLS 1.2. Confirm the registry settings, but no additional changes are required.
Note
Starting in version 2107, Configuration Manager requires Microsoft .NET Framework version 4.6.2 for site servers, specific site systems, clients, and the console. If possible in your environment, install the latest version of .NET version 4.8.
If you're using .NET Framework 4.5.1 or 4.5.2 on Windows 8.1, Windows Server 2012 R2, or Windows Server 2012, it's highly recommended that you install the latest security updates for the .Net Framework 4.5.1 and 4.5.2 to ensure TLS 1.2 can be enabled properly.
For your reference, TLS 1.2 was first introduced into .Net Framework 4.5.1 and 4.5.2 with the following hotfix rollups:
Configure .NET Framework to support strong cryptography. Set the SchUseStrongCrypto registry setting to DWORD:00000001. This value disables the RC4 stream cipher and requires a restart. For more information about this setting, see Microsoft Security Advisory 296038.
Make sure to set the following registry keys on any computer that communicates across the network with a TLS 1.2-enabled system. For example, Configuration Manager clients, remote site system roles not installed on the site server, and the site server itself.
For 32-bit applications that are running on 32-bit OSs and for 64-bit applications that are running on 64-bit OSs, update the following subkey values:
The SchUseStrongCrypto setting allows .NET to use TLS 1.1 and TLS 1.2. The SystemDefaultTlsVersions setting allows .NET to use the OS configuration. For more information, see TLS best practices with the .NET Framework.
Update Windows and the default TLS that you use for "WinHTTP". Identify and reduce you dependency on the client apps and operating systems that don't support TLS 1.2. Enable TLS 1.2 for applications and services that communicate with Azure AD.
In the Settings page, scroll down to the bottom and choose Show advanced settings. Scroll further down to the Network section and choose Change Proxy settings. In the Internet Properties box, choose the Advanced tab. Scroll down to the Security category, ensure that Use TLS 1.2 is selected.
To set TLS 1.2 by default, do the following: Create a registry entry DefaultSecureProtocols on the following location: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\WinHttp. Set the DWORD value to 800 for TLS 1.2.
The fix is easy: In the windows search box, near the Windows Start button, type Internet Options. Open the result “Internet options - control panel”. Then click the Advanced tab. Scroll down in the long list to “security” and make sure “use TLS 1.2” is checked.
Enter the URL you wish to check in the browser. Right-click the page or select the Page drop-down menu, and select Properties.In the new window, look for the Connection section. This will describe the version of TLS or SSL used.
Sign in to a ChromeOS device with a user account in the domain where the certificate was applied. Go to a site where TLS inspection is applied by your web filter. Verify the building icon is in the address bar. Click it to see details about permissions and the connection.
Under TLS Versions, you will see the TLS protocol version(s) currently selected. To update the protocol, simply click edit.Next, choose your desired protocol based on your requirements and hit Save Changes.
How do I know if a server supports TLS version? Log into the server via SSH. Execute the command: # nmap --script ssl-enum-ciphers -p 443 example.com | grep -E "TLSv|SSLv" Note: replace the example.com with the name of the required domain. The output will be as shown below: # | SSLv3: No supported ciphers found.
Enable TLS 1.1 and 1.2 on Windows 7 at the SChannel component level. Per the TLS-SSL Settings article, for TLS 1.1 and 1.2 to be enabled and negotiated on Windows 7, you MUST create the "DisabledByDefault" entry in the appropriate subkey (Client) and set it to "0".
Right click on the Protocols folder and select New and then Key from the drop-down menu. Once you click on the key option, this will create a new folder “New Key #1”. You have to rename it with the name “TLS 1.2”. Right click on the TLS 1.2 key and select New and then Key from the drop-down menu.
Select Transport Manager > Maintenance > Transport. The Transport Manager > Maintenance > Transport page appears. Click on the row to highlight the Transport you wish to enable.
Each segment in a cipher suite name stands for a different algorithm or protocol. An example of a cipher suite name: TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256. The meaning of this name is: TLS defines the protocol that this cipher suite is for; it will usually be TLS. ECDHE indicates the key exchange algorithm being used.
TLS_AES_256_GCM_SHA384. Essentially, this SSL cipher suite now includes only two elements: an encryption algorithm and a hashing algorithm. The key exchange takes place through the Diffie-Hellman algorithm, as RSA is eliminated entirely.
The connection is manipulated or intercepted by a third-party. The server doesn't support the protocol used by the client. The server doesn't support the cipher suite used by the client. SNI-enabled servers can't communicate with the client.
While TLS 1.2 can still be used, it is considered safe only when weak ciphers and algorithms are removed. On the other hand, TLS 1.3 is new; it supports modern encryption, comes with no known vulnerabilities, and also improves performance.
Click the padlock icon in the address bar for the website. Click on Certificate (Valid) in the pop-up. Check the Valid from dates to validate the SSL certificate is current.
The public key is embedded in the TLS/SSL certificate and is used to encrypt data from the sender. The private key is in a separate file that should be stored securely on your server and can be used for both encryption and decryption.
Click Start or press the Windows key. In the Start menu, either in the Run box or the Search box, type regedit and press Enter. The Registry Editor window should open and look similar to the example shown below. Check the subkeys for each SSL/TLS version for both server and client.
In the Settings page, scroll down to the bottom and choose Show advanced settings. Scroll further down to the Network section and choose Change Proxy settings. In the Internet Properties box, choose the Advanced tab. Scroll down to the Security category, ensure that Use TLS 1.2 is selected.
TLS Server Profile mode provides the commands to create or modify a TLS server profile. To enter the mode, use the Crypto ssl-server command. To delete a TLS server profile, use the Crypto no ssl-server command. While in this mode, use the commands in the following table to define the TLS server profile.
Run the command: on CentOS/RHEL-based distributions. # grep SSLProtocol /etc/httpd/conf.d/ssl.conf. SSLProtocol +TLSv1.2. on Debian/Ubuntu-based distributions. # grep -ir SSLProtocol /etc/apache2/*
In the left pane, click Connections. In the right pane, right-click the connection that you want to configure, and then click Properties. On the General tab, click Edit next to Certificate. In the Select Certificate dialog box, click the certificate from the list that you have bought for your Terminal Server Hostname.
Navigate to Computer Configuration → Windows Settings → Security Settings → Public Key Policies. Right-click on Automatic Certificate Request Settings and select New → Automatic Certificate Request. Click Next. Under Certificate Templates, click on Domain Controller and click Next.
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