[j-nsp] M20 password recovery procedure

mohamed attia m_attia100100 at hotmail.com
Sat Jan 30 08:13:14 EST 2010

Recovering the Root Password

If you forget the root password for the router, you can use the password recovery procedure to reset the root password. 

Note: You need console access to recover the root password. 
To recover the root password:
1.      Power off the router by pressing the power button on the front panel. 
2.      Turn off the power to the management device, such as a PC or laptop computer, that you want to use to access the CLI. 
3.      Plug one end of the Ethernet rollover cable supplied with the router into the RJ-45–to–DB-9 serial port adapter supplied with the router. 
4.      Plug the RJ-45–to–DB-9 serial port adapter into the serial port on the management device. 
5.      Connect the other end of the Ethernet rollover cable to the console port on the router. 
6.      Turn on the power to the management device. 
7.      On the management device, start your asynchronous terminal emulation application (such as Microsoft Windows Hyperterminal) and select the appropriate COM port to use (for example, COM1). 
8.      Configure the port settings as follows: 
o    Bits per second: 9600 
o    Data bits: 8 
o    Parity: None 
o    Stop bits: 1 
o    Flow control: None 
9.      Power on the router by pressing the power button on the front panel. Verify that the POWER LED on the front panel turns green. 
The terminal emulation screen on your management device displays the router’s boot sequence. 
10.  When the following prompt appears, press the Spacebar to access the router’s bootstrap loader command prompt: 

Hit [Enter] to boot immediately, or space bar for command prompt.
Booting [kernel] in 9 seconds...
13.  At the following prompt, enter boot -s to start up the system in single-user mode. 
ok boot -s
14.  At the following prompt, enter recovery to start the root password recovery procedure. 
Enter full pathname of shell or 'recovery' for root password recovery or RETURN for /bin/sh: recovery
15.  Enter configuration mode in the CLI. 
16.  Set the root password. For example: 
user at host# set system root-authentication plain-text-password
17.  At the following prompt, enter the new root password. For example: 
New password: juniper1
Retype new password:
18.  At the second prompt, reenter the new root password. 
19.  After you have finished configuring the password, commit the configuration. 
root at host# commit
commit complete
20.  Exit configuration mode in the CLI. 
21.  Exit operational mode in the CLI. 
22.  At the prompt, enter y to reboot the router. 
Reboot the system? [y/n] y 


Best Regards,

Eng. : Mohamed Attia

+2 0102039799


> Date: Thu, 28 Jan 2010 12:36:46 -0800
> From: ncnet at sbcglobal.net
> To: juniper-nsp at puck.nether.net
> Subject: [j-nsp] M20 password recovery procedure
> M20 running Junos5.7 and we've attempted to follow
> the password recovery procedure from single user but are getting disk
> read errors when invoking /usr/libexec/ui/recovery-mode; the fsck to
> repair these eventually fails.
> The issue is that `/usr/libexec/ui/recovery-mode` needs to run fsck, the
> fsck fails, and the CLI from which you can set the root password is never
> invoked. We're attempting to unpack and edit the configuration files
> directly because password data is not handled in the traditional UNIX way.
> Ie., there is no `passwd` command or /etc/passwd & /etc/shadow
> Please advise.
> ~.~
> Best regards,
> Larry E. Stites
> Northern California Networks, Inc.
> Nevada City, Calif. 95959
> _______________________________________________
> juniper-nsp mailing list juniper-nsp at puck.nether.net
> https://puck.nether.net/mailman/listinfo/juniper-nsp
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