Fresh installation, error message on /config and /files permissions

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I could not install a fresh installation of concrete 5.6.3.1 on a well configured server, where i had before another C5 installation. To bypass the problem, I've used a non orthodox and simple way:
- set 777 chmod to the root dir (I know, security guys will have a heart attack for that ;-)
That permit me to pass through the first installation step
- install the package
- reset to 755 chmod to the root dir
- set right permissions to the /config and /file dir
that's works!
KISS (Keep it Simple and Stupid)
Luca

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