The ‘root’ user cannot switch to VDS account shell by “su” command and
"Operation is not permitted" error message is given.
Also new accounts are prevented from being created.
One of the reasons for this may be incorrect permissions of the /bin/chrootsh file.
Please ensure that the permissions are as follows:
-r-sr-xr-x 1 root bin chrootsh
Note: The file must have SUID bit.