Comments - **Only if not connected to Internet** : Access denied for user '<user>'@'localhost' (using password: YES)
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Add 127.0.0.1 localhost to your hosts file (/etc/hosts on Linux/Mac, C:\Windows\System32\drivers\etc\hosts on Windows). In MariaDB’s config (my.cnf or my.ini), set bind-address to 127.0.0.1 to keep it on the local network. Recreate your user with permissions for '<user>'@'localhost' instead of '% to ensure consistent access offline.
This should help