All of a sudden by Arris SB8200 is asking for log in

If you've never set them, most manufacturers default to user: admin, password: password.

It's a security feature in the latest update. The login name is "admin", and the password is the last 8 digits of the modem's serial number. You will then be asked to create a new password.

https://arris.secure.force.com/consumers/articles/General_FAQs/SB8200-Web-Manager-Access

Of course that is not working.    I type in the last 8 of serial number and it still shows invalid username and password.  Glad they did this to custoemr provided equipment... Classy.

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@kgowen4444 wrote: ... I type in the last 8 of serial number and it still shows invalid username and password. ...

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Does https://arris.secure.force.com/consumers/articles/General_FAQs/SB8200-Factory-Reset help? :

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NOTE: On firmware version 1.01.009.47 and later, holding the Reset button down for 10 seconds will reset the modem and revert the custom admin password back to the default password (last 8 digit of the serial number).

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@tburton82 wrote: Disregard. the alpha characters are case sensitive.

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Characters in passwords usually are, but thanks for posting that this is the case for the SB8200. Note that https://arris.secure.force.com/consumers/articles/General_FAQs/SB8200-Web-Manager-Access states that the new custom password you enter must meet these requirements:

• Minimum of 8 to 20 maximum characters
• At least one uppercase alpha character
• At least one lowercase alpha character
• At least 1 number
• One of ~ ! @ # $ % ^ * ( ) - _ = + [ ] { } | ; : , . / ?

This list really should include a note that "passwords are case-sensitive", but that information seems to be given only in a graphic below this list.

I'm having the same issue, last 8 digits of SN don't work. I also tried the last 8 digits of the MAC that doesn't work either. Does anyone else have any ideas? 

Disregard. the alpha characters are case sensitive.

@andyross Andy Thanks for this very timely advice, it's a life saver.  I had exactly this same problem and your tip worked! I wasn't prompted to set up a custom password but I did anyway so that I didn't have to remember the SN. Thanks for ending the fruatration I'd been having trying to login.

Had been a while since I accessed modem and did just now because of this thread.

Even though it didn't prompt me to change password when I logged in using last 8 digits of the S/N, for security purposes, I am going to change it. 

Thank you

Yea this worked !!! just a note my serial # was two letters and six numbers entered letters as CAPS and it worked

5 month old dead thread now being closed.