Receiving error when running the data migration tool: SQLSTATE[28000] [1045] Access denied for user 'USERNAME'@'localhost' (using password: YES)

Question

Receiving this error when trying to run the data migration tool:

[Zend_Db_Adapter_Exception]
SQLSTATE[28000] [1045] Access denied for user 'USERNAME'@'localhost' (using password: YES)

[PDOException]
SQLSTATE[28000] [1045] Access denied for user 'USERNAME'@'localhost' (using password: YES)

I've tried the IP, and domain name, as well as localhost, which all receive the same error?

Near nothing on the net regarding this, so reached out here.

I know the credentials are correct, and the Magento 2 store is up, and running fine.

Any assistance will be much appreciated.

Answer 1

Okay, I have found the error in my ways, and figured I'd share in hope to help others who may have made the same mistake.

In my case I had put in the credentials for the Magento 2 database in the Magento 1 <source> connection.

As everyone says, double, triple verify your credentials!