n98-magerun – access denied – Exchange Magento stack

I can not use n98 magerun to create a dump of my database I get mysqldump: Error obtained: 1045: "Access denied for the user" example "@example.de (with password: YES)" while trying to login . after performing ./n98-magerun.phar db: dump

But the powers in app / etc / local.xml are obviously correct, otherwise the store would not work. Is it possible that the password is too complex or that special characters like!% $ ยง cause problems?