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ANWESHA BHATTACHARYYA 20ANWESHA BHATTACHARYYA 20 

Security Token expired without change in password

We have created an user with no password expire for CLI Data Loader . Recently the server changed where the data loader was installed. 
CLI dataload has stop working and is throwing an error ''Failed: API security token required". What is the reason for this error . All the post so far I have read is asking to reset the Security token but for this user the password was not changed ever . Is it possible that the security token changed even without changing password?  
Best Answer chosen by ANWESHA BHATTACHARYYA 20
Rahul KumarRahul Kumar (Salesforce Developers) 
Hi Anwesha, Please mark it as best answer if the information is informative.so that question is removed from an unanswered question and appear as a proper solution.

Thanks
Rahul Kumar