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

Question

We are unable to connect to an HTTPS server using WebRequest because of this error message:

The request was aborted: Could not create SSL/TLS secur

Answer 1

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

In our case, we where using a software vendor so we didn't have access to modify the .NET code. Apparently .NET 4 won't use TLS v 1.2 unless there is a change.

The fix for us was adding the SchUseStrongCrypto key to the registry. You can copy/paste the below code into a text file with the .reg extension and execute it. It served as our "patch" to the problem.

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\.NETFramework\v4.0.30319]
"SchUseStrongCrypto"=dword:00000001

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\.NETFramework\v4.0.30319]
"SchUseStrongCrypto"=dword:00000001