We can use “|=” and configure the ServicePointManager’s SecurityProtocol to turn on the TLS versions and thereby not remove support for other protocols. System.Net.ServicePointManager.SecurityProtocol |= SecurityProtocolType.Tls11 | SecurityProtocolType.Tls12;
You can use the following script to enable TLS 1.2 on a server using PowerShell. $regFile = @”Windows Registry Editor Version 5.00[HKEY_LOCAL_MACHINESYSTEMControlSet001ControlSecurityProvidersSCHANNELProtocolsTLS 1.2][HKEY_LOCAL_MACHINESYSTEMControlSet001ControlSecurityProvidersSCHANNELProtocolsTLS 1.2Client]”Enabled”=dword:ffffffff”DisabledByDefault”=dword:00000000[HKEY_LOCAL_MACHINESYSTEMControlSet001ControlSecurityProvidersSCHANNELProtocolsTLS 1.2Server]”Enabled”=dword:ffffffff”DisabledByDefault”=dword:00000000″@Invoke-Command -ScriptBlock {param($regFile) $regFile | out-file