The solution is to add the user/password again, for the computer you're
connecting from. Assume that you're on a local network, and your IP is
192.168.0.10. Log into the mysql console as root and issue the command

GRANT ALL PRIVILEGES ON *.* TO erik@1... IDENTIFIED BY
'erik007';

This gives user 'erik' with password 'erik007' the right to connect from
192.168.0.10, access any database and perform any operation on them.

Johan Kvarnström.