I didn't have security keys until now. I've added those, however I still get the same error. My database configuration seems to be fine, I've followed the exact steps you describe here.
Can a wrong security key cause this type of errors ? I've typed them manually so I can't garantee that they are 100% the same as those of the page you gave me a link to.
Is there a way to give an overview of my current setup so I can show it to you and maybe find what's wrong ?
I've been through the pages you added in your edit while trying to fix my problem, found nothing I might have done incorrectly.
PS : This problem isn't vital for me, I'm trying to set this up only for private fun, thank you very much for helping me, don't feel like this is too important.