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Could you boot into single user mode without root password?<br />
<br />
If you are using LILO, specify one of these options at the LILO boot prompt (if you are using the graphical LILO, you must press [Ctrl]-[x] to exit the graphical screen and go to the boot: prompt): <br />
<br />
boot: linux single<br />
<br />
Then at shell prompt &quot;#&quot;, type<br />
passwd root &nbsp; (to reset the password)<br />

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Could you boot into single user mode without root password?

If you are using LILO, specify one of these options at the LILO boot prompt (if you are using the graphical LILO, you must press [Ctrl]-[x] to exit the graphical screen and go to the boot: prompt):

boot: linux single

Then at shell prompt "#", type
passwd root   (to reset the password)


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I have forget the redhat6.2 passsword,now i go to rescue mode and type command<br />
chroot /mnt/sysimage but it is showing me error....<br />
&quot;cannot change root directory to /mnt/sysimage:No such file or directory&quot;<br />
Plz help me to change the root password.<br />
<br />
Manish 
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I have forget the redhat6.2 passsword,now i go to rescue mode and type command
chroot /mnt/sysimage but it is showing me error....
"cannot change root directory to /mnt/sysimage:No such file or directory"
Plz help me to change the root password.

Manish 

unable to change root directory to /mnt/sysimage(chroot /mnt/sysimage) in Rescue mode

The Linux operating system, in all its flavors, has its own share of security flaws that allow intrusions, but there are various mechanisms by which these flaws can be removed, generally divided into two parts: authentication and access control. Authentication is responsible for ensuring that a user requesting access to the system is really the user with the account, while access control is responsible for controlling which resources each account has access to and what kind of access is permitted.