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I am able to login to data loader for production instance however I am able to login to sandbox. I am adding the security token at the end too. I am using version 37 of data loader and windows 7.
When I try to login into data loader, I get a login error "Error:Check your username and password. If you still can't login, contact your Salesforce admin". I am sure that I am using the correct username and password. I am also adding security token at the end of password.
guess you are NOT able to login somewhere go to dataloader settings and change
https://test.salesforce.com for sandbox
https://login.salesforce.com for production
If Login history doesn't show the login attempt, it means your user name is wrong.
Be sure that server host is https://test.salesforce.com and your sandbox name added end of the org. username.
With the newer version there is a new option available called "Password Authentication". Can you please try with this.
