Can't connect Chromebook to internet through EX2800

I can connect my Chromebook to my EX2800 wifi extender (even use the genie to configure the extender), but I cannot access the internet.  Instead I get the error: "The wi-fi network you are using may require you to visit its login page."  I can access the internet with other devices using the extender, but not the Chromebook that I used to configure the extender to begin with.  My OS is up-to-date.  The firmware on the extender is V1.0.1.64.  This is relatively new behavior - I used to be able to access the internet with the Chromebook.