Please check the credentials again. The most common cause of the "can't connect" error is a typo in the credentials. You're frustrated and it is easy to see what should be there instead of what is (yes, that's the voice of experience).
The restore process can't create a database, only add tables and data to an existing database. If you deleted your database instead of dropping the tables in preparation for your restore, that could be the cause.
After that we get into the wild and crazy. Did you update your PHP version or MySQL installation? You didn't say if this is a local restore or on a commercial host. An environment problem would be more likely on a local install, but we do see them sometimes on commercial hosts too.
Dale L. Brackin
Support Specialist
English: native
Please keep in mind my timezone and cultural differences when reading my replies. Thank you!
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My time zone is
EST (UTC -5) (click here to see my current time in Philadelphia, PA)