[CentOS 5.5/ISPConfig 3] mount: permission denied

Hello, I am following the perfect server HOWTO for CentOS 5.5 w/ ISPConfig 3. When install quota it goes wrong, when using # mount -o remount / I just get mount: permission denied.

/etc/fstab

Code:

/dev/simfs / simfs      defaults,usrquota,grpquota 0 0
none    /dev/pts        devpts  rw      0       0

cat /proc/mounts

Code:

/dev/simfs / simfs rw 0 0
proc /proc proc rw 0 0
sysfs /sys sysfs rw 0 0
none /dev tmpfs rw 0 0
none /dev/pts devpts rw 0 0
none /proc/sys/fs/binfmt_misc binfmt_misc rw 0 0

I tried to reboot but it doesn't work.
Please help me out.

 

A reboot should normally work. What's the output of

Code:

repquota -avug

?