Re: Website won't work without www
Hello LarryD and welcome,
Not sure this is a Comcast Gateway issue but seems like a browser specific one. There are no Comcast Gateway parameter settings that handle this whatsoever.
Sometimes various browser settings require the full ip address name including the www.xxxxx.com, so make sure your browser settings are correct. I just tried s-d-g.net using Windows 10 Edge browser and I get Structural Design Group website no problem.