chmod not working on vbox shared folder

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http://serverfault.com – The folder /var/www was mounted during init, using: mount -t vboxsf cuckoo_shared /var/www/ -o uid=1000,gid=1000,rw,dmode=755 Now, all the files belong to my user jdrummond as default. And also have 755 as default mode. But now every chmod that I try to run doesn't seem to work: My doubts on this are: First: why is my index.php file 777 even when I said it should be 755 on the mount command? Second: why isn't my chmod working? Thanks I've tried to run the chmod command with sudo but it also didn't work. Virtualbox 4.1.18: Host = Windows 7 Guest = Ubuntu 11.04. (HowTos)