A Call To SSPI Failed, See Inner Exception - The Local Security Authority Cannot Be Contacted


Answer :

This means the other side is using another version of TLS and you are using an older version.
Set up security attribute to TLS12 before making the connection. This is a widely known problem, as many providers start using TLS12 (e.g. paypal,amazon and so on).

ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;

Here is the solution, set in the registry:

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\KeyExchangeAlgorithms\Diffie-Hellman] "ClientMinKeyBitLength"=dword:00000200

as noted here


If you are using SslStream, then you need to explicitly set the TLS version in the AuthenticateAsClient call, for example:

ssl.AuthenticateAsClient(url, null, SslProtocols.Tls12, false);

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