Can't access newly created Subversion repos

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http://serverfault.com – Sorry in advance, I'm pretty new in server configuration. So I followed this tutorial to install Subversion on my CentOS server. I'm at the part I should test the URL to make sure I can access it and that it's password protected, but it's not working, I can't access it. What is wrong? Is there some config missing? I don't know what more details to give, but if you need some, please ask! :) Thanks in advance. (HowTos)