Broken TLS connection from an ASP.NET MVC application

Question

I have an ASP.NET MVC application that makes call to an external service that support only TLS1.2 protocol.

When the code makes the call I get this error:

System.Net.Http.HttpRequestException HResult=0x80131500 Message=An error occurred while sending the request.

WebException: The request was aborted: Could not create SSL/TLS secure channel.

It seems that my side (the client one) does not support TLS1.2.

My question are:

How can I enable TLS1.2 in a .NET 4.7 application?
Is it something that I can force in the code?
Consider that the app will be deployed on an Azure APP SERVICE, so I cannot manage IIS settings machine registry stuff.

Thanks, \sergio

Nagib Mahfuz · Accepted Answer · 2021-06-26 07:40:07Z

1

I think you can do this in code level with below line before calling web service

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

If you are not sure of the protocol you can use below

System.Net.ServicePointManager.SecurityProtocol = SecurityProtocolType.Ssl3 | SecurityProtocolType.Tls12 | SecurityProtocolType.Tls11 | SecurityProtocolType.Tls;

answered Jun 26, 2021 at 7:40

Nagib Mahfuz

83310 silver badges21 bronze badges

Sign up to request clarification or add additional context in comments.

3 Comments

Sergio Armenia Over a year ago

Unfortunately this does not work for me. I've tried to add the line System.Net.ServicePointManager.SecurityProtocol = System.Net.SecurityProtocolType.Tls12 both before calling the web service, and in the Global.asax Application_Start method, but the result is the same "The request was aborted: Could not create SSL/TLS secure channel."

Sergio Armenia Over a year ago

To adds more, the code calling the external web service works fine wheter I run it from my win10 laptop, while it fails when run from a Windows Server 2012 r2. Clearly Win10 has a different TLS1.2 support compared to the WindowsServer 2012R2 one. Maybe I have to add something to the WindowsServer 2012R2 to support TLS12?

Nagib Mahfuz Over a year ago

check This

Collectives™ on Stack Overflow

Broken TLS connection from an ASP.NET MVC application

1 Answer 1

3 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

3 Comments

Your Answer

Sign up or log in

Post as a guest

Related