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Captive Portal / Adblock

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So I recently transferred service because I moved.  Since then I have been having trouble with the Comcast "Captive Portal."  Oops!  Activation Incomplete!  I tried to go through the process myself, but it errored out on me.  I called a support rep and he did it for me.


After that I was able to get online, sort of.  Once I got my router hooked up, the captive portal came back.  After some trouble shooting I was able to figure out what was causing the portal to come back.  I run an adblock software on my router, it strips the adverts from webpages by blocking IPs to advertising servers.  When I have this on, the Captive Portal grabs me.  When I turn it off, I get through without issue.  


Now obviously, turn it off is the simple fix.  But this isn't ideal.  Any suggestions on this?