Linux unwelcome in hotels

In three different hotels I've had the same problem using my Ubuntu laptop with the free internet service. I run into an old "reply from unexpected source" error. This is a side effect of how hotels implement redirection to their terms-of-service warning page from any URL. Unfortunately, they're incompetent spoofers. The ISP providing support is GuestDirect, telephone number 1-866-221-6440, and they supply internet service to La Quinta Inns.