用户名，主机和密码的组合不允许连接到服务器。验证服务器上的权限表（重新载入授权，如果需要），并连接到正确的服务器。

That combination of username, host, and password is not allowed to connect to the server. Verify the permission tables (reloading grants if required) on the server and that you're connecting to the correct server.