Issue connecting to Azure Key Vault using C# - For Getting Certificate

Question

Hello,

I have created a certificate in Azure Key Vault and trying to get the certificate using my C# MVC application and getting following error. I have added my web application to Key Vault access policy priniciple. I am using Azure AAD to sign in to my application.

{"error":"invalid_request","error_description":"AADSTS1002016:
You are using TLS version 1.0, 1.1 and/or 3DES cipher which are deprecated to improve the security posture of Azure AD.
Your TenantID is: xyz-xyz-xyz.
Please refer to https://go.microsoft.com/fwlink/?linkid=2161187 and conduct needed actions to remediate the issue.
For further questions, please contact your administrator.

Here is my code for getting certificate.

static KeyVaultClient GetClient() => new KeyVaultClient(new KeyVaultClient.AuthenticationCallback(async (string authority, string resource, string scope) =>  
{  
    var context = new AuthenticationContext(authority, TokenCache.DefaultShared);  
    ClientCredential clientCred = new ClientCredential(CLIENT_ID, CLIENT_SECRET);  
    var authResult = await context.AcquireTokenAsync(resource, clientCred);  
    return authResult.AccessToken;  
}));  
  
var Client = GetClient();  
var Certificate = Client.GetCertificateAsync(CERTIFICATE_IDENTIFIER).GetAwaiter().GetResult();  

Any help here much appreciated! Please let me know if anyone needs any more information.

Thanks

Answer 1

migrate .NET Framework version support to tls1.2 or higher