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Hello, I don't know how is that possible, but all my files and filders/subfolders of my prestashop installation are set to 777. I tried to change it to 755 and 666, 644 but whatever I put I will see the ERROR 500 message and website won't work. With 777 is all fine, but I won't let it stay like that as website will be hacked. 777 is very dangerous setting and even PS manual advise to change permissions to 755 and 644. Why in my case I'm receiving error 500 than? I am on VPS server with Linux Centos 6. Do I need to install additional software or something? I tried to contact my VPS provider. They said: I must say far too many of your files/folders have 777 permissions. This is VERY dangerous and will mean your sites and server will be compromised. Right now all your files are writable by anyone - including all your php files ! I've asked than if he can change permissions for me but he replied: This is not possible,m doing so will break your sites. Only files/folders that apache NEEDS write access to should be 777 or owned by apache/nobody. I changed it manually anyway (all files to 644 and folders 755) but I have an Error 500 now. How I can fix it please?