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New Member

Password recovry - Cisco 851

hello

the " password recovery functionality is disabled " service is running on the system .

im trying to access rommon in a Cisco 851, with not much success, i am sending a break after the image is loaded ( in the time frame that is allowed for that) .

am missing on something here ?

thank you for the help

Guy

13 REPLIES
Hall of Fame Super Gold

Re: Password recovry - Cisco 851

http://www.heinzulm.com/password.php

Please don't forget to rate useful posts.  Thanks.

New Member

Re: Password recovry - Cisco 851

I followed the different instruction and enter the break at a different point, but the system still did not receive my break..

New Member

Re: Password recovry - Cisco 851

Here are the different registry values inorder to break into ROMMON.
0x102 Ignores break; 9600 baud

0x1202 1200 baud

0x2101 Boots to bootstrap; Ignores break; boots into ROM if no IOS; 9600 baud

0x2102 Ignores break; boots into ROM if no IOS; 9600 baud

0x2120 Boots into rommon; 19200 console

0x2122 Ignores break; boots into ROM if no IOS; 19200 baud

0x2124 Uses Netboot; ignores break; boots to ROM if no IOS; 19200 baud

0x2142 Ignores break; boots to ROM if no IOS; 9600 baud; ignore configuration

0x2902 Ignores break; boots to ROM if no IOS; 4800 baud

0x2922 Ignores break; boots to ROM if no IOS; 38400 baud

0x3122 Ignores break; boots to ROM if no IOS; 57600 baud

0x3902 Ignores break; boots to ROM if no IOS; 2400 baud

0x3922 Ignores break; boots to ROM if no IOS; 115200 baud

Please let me know if this was helpful.

Regards,

podhillo

Hall of Fame Super Gold

Re: Password recovry - Cisco 851

He can't get into ROMmon so he can't enter the config-registry. 

New Member

Re: Password recovry - Cisco 851

leolaohoo is right.. that service prevent me from getting the rommon running. I have tries sending a break in a few methods and in different stages of the boot process, at this point it seems to be unstoppable..

New Member

Re: Password recovry - Cisco 851

Hey,

You might want to try looking at this document and see if it works:

https://supportforums.cisco.com/docs/DOC-2407

Hope this helps,

Ross.

New Member

Re: Password recovry - Cisco 851

Standard Break Key Combinations

Software

Platform

Operating System

Try This

Hyperterminal

IBM Compatible

Windows XP

Ctrl-Break

Hyperterminal

IBM Compatible

Windows 2000

Ctrl-Break

Hyperterminal

IBM Compatible

Windows 98

Ctrl-Break

Hyperterminal (version 595160)

IBM Compatible

Windows 95

Ctrl-F6-Break

Kermit

Sun Workstation

UNIX

Ctrl-\l

Ctrl-\b

MicroPhone Pro

IBM Compatible

Windows

Ctrl-Break

Minicom

IBM Compatible

Linux

Ctrl-a f

ProComm Plus

IBM Compatible

DOS or Windows

Alt-b

SecureCRT

IBM Compatible

Windows

Ctrl-Break

Telix

IBM Compatible

DOS

Ctrl-End

Telnet

N/A

N/A

Ctrl-], then type send brk

Telnet to Cisco

IBM Compatible

N/A

Ctrl-]

Teraterm

IBM Compatible

Windows

Alt-b

Terminal

IBM Compatible

Windows

Break

Ctrl-Break

Tip

Sun Workstation

UNIX

Ctrl-], then Break or Ctrl-c

~#

VT 100 Emulation

Data General

N/A

F16

Windows NT

IBM Compatible

Windows

Break-F5

Shift-F5

Shift-6 Shift-4 Shift-b (^$B)

Z-TERMINAL

Mac

Apple

Command-b

N/A

Break-Out Box

N/A

Connect pin 2 (X-mit) to +V for half a second

Cisco to aux port

N/A

Control-Shft-6, then b

IBM Compatible

N/A

Ctrl-Break

Tips to Troubleshoot

  • Problems that you encounter during password recovery often occur because you are not sure about what the break key sequence is for the (non-Cisco) software you use. For software not listed in the table, and for additional information, refer to the documentation of the individual software packages.

  • The auxiliary (AUX) port is not active during the boot sequence of a router. Therefore, it is no use if you send a break through the AUX port. You need to have connection to the console port, and have these settings:

    9600 baud rate

    No parity

    8 data bits

    1 stop bit

    No flow control

  • Some versions of Windows NT have hyperterminal software that cannot send the correct break key signal. Refer to http://www.hilgraeve.com/hyperterminal.html leavingcisco.com for more information and for an upgrade of the hyperterminal software.

  • In some cases, the break sequence might not get transmitted properly when using a USB/Serial converter cable. In such cases, use a keyboard with a different connector port (for example, a PS/2).

How to Simulate a Break Key Sequence

Break key sequence simulation is useful if your terminal emulator does not support the break key, or if a bug does not allow your terminal emulator to send the correct signal.

Note: The hyperterminal under Windows NT had this behavior in the past.

Complete these steps to simulate a break key sequence:

  1. Connect to the router with these terminal settings:

    1200 baud rate

    No parity

    8 data bits

    1 stop bit

    No flow control

    You no longer see any output on your screen, and this is normal.

  2. Power cycle (switch off and then on) the router and press the SPACEBAR for 10-15 seconds in order to generate a signal similar to the break sequence.

  3. Disconnect your terminal, and reconnect with a 9600 baud rate. You enter the ROM Monitor mode.

If all these methods fail to properly send a break, retry the procedures from a different terminal or PC platform.

Regards,

podhillo

Re: Password recovry - Cisco 851

Hi,

Try to do the following, it may help....

1. console to router

2. power cycle the router

3. while rebooting press ctrl+shift+Paus Break key

It should work as I did recently to one of my 881G.

if not working try ctrl+Paus Break

Regards,

Naidu.

New Member

Re: Password recovry - Cisco 851

I am starting to think that maybe there is IOS loaded to the system,

Because i am prity sure that the break sequence is being transmited by the terminal program.

I thin that in that case the system is a really bas problem,

I have similar systems; is there anything that can be done with the other systems to help out this busted one ?

Thanks

Hall of Fame Super Gold

Re: Password recovry - Cisco 851

The only time I see in this forum of individuals having difficult with Ctrl+Break is when they are using a USB-to-Serial adaptor/interface.   You don't happen to use this, by chance, would you?

New Member

Re: Password recovry - Cisco 851

no   , I'm using a standard rs-232 9 pin cable. 

Hall of Fame Super Gold

Re: Password recovry - Cisco 851

Good docu!

New Member

Password recovry - Cisco 851

I got into the same situation and luckily found that the RESET button on the device is the solution.

Good luck !!

--------------------------------------------------------------------

Q. How do you set the router back to its factory default settings?

A. To set the router back to its factory defaults, you can either use  Cisco SDM or you can go into the Cisco IOS Software CLI and do a "write  erase" on the router itself, or grab the factory default configuration  from Cisco Configuration Express. In addition, when the reset button is  pressed within 5 seconds of the boot up and there is a valid xxx.cfg  file in the flash, the router boots up with the xxx.cfg file and avoids  the startup-config file in NVRAM.
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