Why do I keep getting this message when attempting to go to certain websites and is there a work around? (see details)

Usually this has been occurring on fairly little known websites but now it’s a major dept. store, Stein Mart

This only occurs on my iPad but not on my Android phone.

It says: Safari could not open the page because the server cannot be found.

How obscure could this server possibly be since its for a well known stores online shopping site?

Is anyone else with an iPad or iPhone experiencing this?

What’s going on here?