Enable Remote MySQL Connections in cPanel | Liquid Web Knowledge Base: "Now that the remote connection has been activated in the WHM each domain account that wants to use the remote connection will need to activate it in their own cPanel interface.
Enabling Remote MySQL in the Domain cPanel Interface
Using the X3 cPanel theme:
Log in to the domain’s cPanel interface and find the section on the main page labeled Databases.
In the Databases section find the link/button labeled Remote MySQL and click on it."
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