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I upgraded my SB6121 to an SB6183 and called in to get it activated. No issues there. I was able to access the web GUI at http://192.168.100.1 on the new SB6183 initially, however after the modem completed the DOCSIS provisioning and upgraded its firmware, I'm unable to access the web GUI anymore. Was this feature disabled by comcast in the configurations for the SB6183 on their network?
I've checked the user manual a few times, and it wasn't a problem for me to access the Web GUI of my old SB6121 and SB6120's before.
FYI the User manual for the SB6183 lists the information for connecting to the GUI on page 7 of their PDF. http://www.surfboard.com/wp-content/uploads/2014/07/ARRIS_SURFboard_SB6183_User_Guide.pdf
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