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Error while loading data into SFDC using Informatica data loader

I am trying to use informatica data loader in Sandbox. At Target location when i am integrating with SFDC it is showing me the below error. User name and password with security token are entered correctly. I am not sure what mistake i am doing and also i mentioend the url service below. Do i need to make any chanes in URl as it is Sandbox? or what? Please advice.

The login to Salesforce.com failed with the following message - com.sforce.soap.partner.LoginFault: INVALID_LOGIN: Invalid username, password, security token; or user locked out.

URL: https://www.salesforce.com/services/Soap/u/18.0

Thanks in Advance.


Best Answer chosen by Admin (Salesforce Developers) 

You need to use test.salesforce.com to login to sandbox, not www.salesforce.com