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Naveen Kumar 472Naveen Kumar 472 

Getting error while authenticating salesforce login in c#

I am using soap api for salesforce login authentication in c# but getting below error.
UNSUPPORTED_CLIENT: TLS 1.0 has been disabled in this organization. Please use TLS 1.1 or higher when connecting to Salesforce using https.
So I have already deactivated "Critical Updates" in salesforce but still getting same error.
Arun_KharbArun_Kharb
Hi Naveen, 
Salesforce is requiring an upgrade to TLS 1.1 or higher by July 22, 2017 in order to align with industry best practices for security and data integrity.
So better have it enabled now. Because in near future you have to do it somehow.
You have to enable SSL and TLS 1.1 in your app/server.
Here is the link for your reference:
https://help.salesforce.com/articleView?id=000221207&type=1

Please mark this as solution by selecting it as best answer if this solves your problem, So that if anyone has this issue this post can help.
 
Naveen Kumar 472Naveen Kumar 472
So I have checked the salesforce account but there is no option for activate and deactivate the TLS
Arun_KharbArun_Kharb
Then it seems you have a newer version of Org. Because in the new Orgs it is enabled by default and Salesforce is discontinuing support for TLS 1.0, so 1.1 is the only way to go.