Mike-- it's working for me now. Interestingly I am on a different computer than I was earlier, I am at home rather than at the office. I wonder if there is a firewall issue. But in any case, thanks for your time! I do wish the FEMA WMS would work with one of the other imagery basemaps, this older one isn't very good for NYC, the buildings are all askew rather than top-down proper orthophoto. But that's not an Esri issue, is it?
Thanks again,
Kenny