Unexpected error sharepoint console application

Question

Dear Expert,

I have create one console application for performing operation on sharepoint online site. but when I try to run exe, I encountered below error.

Console application main function

try
{
string siteURL = "https://xyz.sharepoint.com/sites/Projects/";
string userName = "xyz@xyz .com";
string password = "xyz@xyz ";

            ClientContext webCxt = new ClientContext(siteURL);  
            SecureString oSecurePassword = new SecureString();  
            foreach (Char c in password.ToCharArray())  
            {  
                oSecurePassword.AppendChar(c);  
            }  

            webCxt.RequestTimeout = System.Threading.Timeout.Infinite;  
            webCxt.Credentials = new SharePointOnlineCredentials(userName, oSecurePassword);  
            webCxt.ExecuteQuery();  

            getAllSubSiteUrls(siteURL, webCxt);  

            Console.WriteLine("Done");  
            Console.ReadLine();  
        }  
        catch (Exception ex)  
        {  
            Console.WriteLine(ex.Message);  
            Console.ReadLine();  
        }

Kindly advice.

Answer

Hi @Anonymous ,

Since the issue related to default TLS settings of a web request. We found that the error occurs when .Net Framework version is lower than 4.6.
Can we confirm what version of .Net Framework you are using? If your Framework version is lower than 4.6,you can take following suggestion:
We can add following code to the beginning of our code:

ServicePointManager.SecurityProtocol |= SecurityProtocolType.Tls12;

Or we can change the .Net Framework to 4.6 and above.

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