TLS 1.2 Issue -tetsing on sandbox

[smitham]

I'm trying to create some test transactions on sandbox. I have IIS 10.0 express and .net 4.6 and i got the error saying that the existing connection was forcibly closed by the remote host. Do we have to do any code changes to fix this?

[NexusSoftware]

Try adding the following at the beginning of the function where you make a webrequest:

System.Net.ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12 | SecurityProtocolType.Tls11 | SecurityProtocolType.Tls;

[smitham]

Sorry this did not help.

[NexusSoftware]

Although you may have .Net 4.6 installed, what version are you targeting in your application?

[smitham]

I think it is targeting 4.0. I cannot use SecurityProtocolType.Tls12 and SecurityProtocolType.Tls11. I can only use SecurityProtocolType.Tls and which is TLS 1.0 so it cannot connect

[smitham]

Target >net Framework 4.5

[NexusSoftware]

Post the code you are using to make the request.

[smitham]

It got fixed with this code

const SslProtocols _Tls12 = (SslProtocols)0x00000C00;

const SecurityProtocolType Tls12 = (SecurityProtocolType)_Tls12;

ServicePointManager.SecurityProtocol = Tls12;