Blocking of USPS.com RBR50

Mid-afternoon on 1/18 I couldn't get to USPS.com (You don't have permission to access "http://www.usps.com/" on this server.), didn't sweat it, but still can't get there today.  Have Spectrum for Broadband, had them reset my IP at the router, still no connection.  If I attach a computer directly to the modem, no problem.  I've reset my RBR50 and RBS50, loaded current firmware (both now at V2.1.2.18), powered off modem, powered of RBR's.  Left them both powered off for 5 minutes, etc.

My test of the laptop directly to the model would seem to exonerate Spectrum.  Ideas?

Thanks

Charlie