If you are getting the "SFDC_AUTHENTICATION_ERROR" and Error message as "Invalid or locked out salesforce.com user ID or password in configuration" then please follow the below steps:

  • Go to your Server where Email2case build is configured
  • Open the sfdconfig.txt file and append the security token with password 
  • Save the file and run the batch file again, these steps resolve the SFDC_AUTHENTICATION ERROR.