My phpBB files are saved in "/usbdrive/www/phpBB" everything in "/usbdrive/www" can be accessed from the internet. You wrote that I should write the absolute path in the database hostname field. So if I write there "/usbdrive/forum.db" I'm getting following error:
"The database file specified is within your board directory tree. You should put this file in a non web-accessible location."