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How to access SB8200 Web portal? I have an ARRIS username and PW and it doesn’t work. I also get a warning that 192.168.100.1 is insecure.

SB8200 is just a cable modem so when you access modem settings page we would suggest to try on direct connection without router and follow the steps mentioned on the below article to access GUI and on the password field try entering your modem serial number last 8digits or try the word password in lowercase.

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