connecting to an enterprise 250

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connecting to an enterprise 250

Postby archimede » Tue, 18 Nov 2003 06:45:18 GMT

Hi
I just bought an enterprise 250
I' ve no Sun keyboard, no OS CDs, the machine was a production one
so it was configured with a password, seems to work normally (I guess it 
from the leds), no video card, the only thing I own is a serial to rj45 
connector placed on the serial port that I suppose was used to login.
I meant to enter to single user mode so that I could have changed the 
passwd, unfortunately neither with hyperterminal nor minicom I could get 
in. Settings was standard 9600 8N1 no flow control.
On the laptop side I used the only connector that could fit... a cisco 
one connected to the laptop serial port through a rj45 cable.
My question is simple
how can I see the prompt and access to the BIOS?
Thanks in advance


Re: connecting to an enterprise 250

Postby Bruce D Porter » Tue, 18 Nov 2003 07:13:00 GMT




You need a null modem connection serial cable (2&3 crossed, 7 straight
through. This wiil get you to a console session.

From here you can boot to single user but need to know the password.

Getting tothe OBP (sending a break) will not get you past this.
You need a boot CD at that point (or a JumpStart server) and boot cdrom -s
(or boot net -s).

Then you need to mount and edit the / file system before editing out the
root password (/etc/passwd).

But it sounds like you may aswell rebuild from scratch anyway.

-- 

	Bruce
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Re: connecting to an enterprise 250

Postby Darren Dunham » Wed, 19 Nov 2003 07:15:14 GMT



Make sure it's really the serial port and not the parallel port.


Sorry, you still have to enter the system password even if you boot to
single-user.

You would either need installation media or some root attack on the
computer if you want to change the password without knowing it.


There is no standard for RJ-45 serial.  While the sun/cisco version is
pretty popular these days, I've met a lot that aren't the same.

It's entirely possible that your jumper is bad, or that your rj-45
converters are not acting in the method needed to create a null modem
cable.  Unless you know the cable works by testing it elsewhere, I'd
assume that's your problem.


With a proper null-modem cable and default settings on the machine, you
should be able to access the Open Boot Prom (not a BIOS).  From there
you can boot different devices.

-- 
Darren Dunham                                            XXXX@XXXXX.COM 
Unix System Administrator                    Taos - The SysAdmin Company
Got some Dr Pepper?                           San Francisco, CA bay area
         < This line left intentionally blank to confuse you. >

Re: connecting to an enterprise 250

Postby Paco » Sat, 22 Nov 2003 08:42:53 GMT

Hi,

    Cisco connector is not a good idea, they use some another pin
configuration. You can use a plain cable from your serial port to the "A"
port of your E250, using a Null-modem conversor, but it should work with
serial-to-RJ45 conversor (try with another RJ45-to-serial adaptor). To get
access to the "bios" (actually, OPB), you can press Break during boot
process, so you'll get the ok prompt.

    Regards,

        Paco.


"archimede" < XXXX@XXXXX.COM > escribi?en el mensaje





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