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Querying Salesforce Data Fails in Informatica

 I have a scheduled daily task in Informatica which queries data from Salesforce to SQL. This task has been working fine but has been failing in the past few days. There were no changes made on this task recently. Below is a screenshot from the activity log with the error message:

User-added image

I've read a few discussions about this error and most of them would say that it is Salesforce-related. Any ideas on how to get rid of this error?
check below:

did the user which informatica workflow using reset security token? changed password?  been deactivated?