Is that possible to send HttpWebRequest using TLS1.2 on .NET 4.0 framework

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Yes, it supports it but you must explicitly set the TLS version on the ServicePointManager. Just have this code run anytime (in same app domain) before you make the call to Experian:

System.Net.ServicePointManager.SecurityProtocol = System.Net.SecurityProtocolType.Tls12

Update

see @iignatov ‘s answer for what you must do for framework v4.0. My code works with 4.5+

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