Can't login to sandbox using SalesforceSharp

Question

When I try to login to my sandbox using SalesforceSharp, I'm getting the following error message:

InvalidGrant: Authentication Failure

Here's what I've done:

• Pass in the username, password, clientId, and clientSecret (SalesforceSharp)
• Append my security token to the end of my password (SalesforceSharp)
• Set "Relax IP Restrictions" on the connected app that I created for API access (Salesforce UI)
• Set "All users may self-authorize" (Salesforce UI)
• Set authFlow.TokenRequestEndpointUrl = "https://test.salesforce.com/services/oauth2/token"; instead of the default login.salesforce.com... (after the default failed) (SalesforceSharp)

Any ideas?

Answer 1

I am using SalesforceSharp regularly against my sandbox. I use the following to authenticate:

var authflow = new UsernamePasswordAuthenticationFlow(_clientIdParameter, _clientSecretParameter, _salesforceUser, _salesforcePass);
if (testMode) authflow.TokenRequestEndpointUrl = "https://test.salesforce.com/services/oauth2/token";

try
  {
    ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls11 | SecurityProtocolType.Tls12;
    _client.Authenticate(authflow);
  }
catch (Exception ex)
{
  //
}

Are you appending the instance to the username? (eg [email protected]).

Only other thing I have done is whitelisted my IP to avoid the need to pass the security token.