The most common reason is that the command does not have "eXecute permission". You can check this by "ls -l /bin/ntpdate" where you will find that the first column (which shows the permissions) will look something like "-rw-rw-r--". The easiest way to fix this is to do a "chmod 755 /bin/ntpdate", after which the permissions should look like "-rwxr-xr-x".Quote:
Originally Posted by dyrplq