Safari for Mac

I have someone using Safari for Mac and he has trouble seing his website : https://www.laboiteanoe.com. He gets an error message saying that the serveur cut the connection….None of the pages is available with Safari.

I tested with Safari and various other explorers but on PC and I have no trouble seing the site.

Could someone using Safari + Mac can check this page for me and see if it works? It would be really appreciated.

Thank you!