Why can’t I log in to Data Loader?

Hi Manpreet,

If you’re having trouble logging in to Data Loader, try the following solutions.

• Add a security token to the end of your password to log in to Data Loader.
• Change the Server host to point to the appropriate server in Data Loader by following these steps:
• Start the Data Loader.
• Navigate to Settings | Settings.
• Set Server host to https://yourInstance.salesforce.com/, whereinstance_name is the Salesforce instance you’re on.
• Click OK to save your settings.
• Ask your administrator whether you’re working behind a proxy server. If so, adjust your Data Loader settings. If you’re using APIs that are behind a proxy server, the proxy server prevents the APIs from connecting with Salesforce servers; you won’t see information about the APIs under Login History.
• Try to log in on another computer to verify that your local device settings aren’t causing the problem.

Hope this may help you

thanks