Unlike the sibling, I've never encountered a hotel with all ports blocked. But I have encountered hotels where there is no way to choose other ports. In that case, I've just unplugged their STB and plugged my FS in.
This was a bummer just the other day where my iPhone somehow (and I still don't know how) auto-signed into an amazingly fast wifi AP managed by my cell provider, but I was stuck working on crappy guest wifi on my laptop and could not get the laptop onto the better wifi.