Wordpress Multisite “Error establishing a database connection” in localhost

Question

When attempting to convert WordPress to a Multisite setup, I get the error:

Error establishing a database connection

I\'m using

Answer 1

Inspired by Sabin's answer, I checked wp_blogs and found that the domain value was still pointing to the wrong domain (I was moving a multi-site to a dev server). Running UPDATE wp_blogs SET domain='example.com'; fixed my issue (note that I'm using subfolder multisite, not subdomain - don't blindly run that SQL!)