dmesg no output

[dmesg command no out pu]

Hi All,
Help me on this. Whenever I am running the command dmesg output on some of the servers giving the message "Can't get kernel namelist "(where I logged as root ) other Server are giving this message "Can't read kernel memory"(where I logged as normal user I am not having root access on this box).

[A. Clay Stephenson]

One Possible reason for the first case is that the box was booted on a kernel other than /stand/vmunix. E.g. the box was booted using /stand/vmunix.prev so that the expected symbol no longer matches /dev/kmem.

Second Case:
If a user does not have permission to read /dev/kmem then this is exactly the expected behavior. A non-root user should never be able to read /dev/kmem as this would be a huge security risk.