Safari is a browser like chrome that comes with Apple’s devices. It becomes the fastest-running browser in the world but sometimes safari can't connect to server and the major factor behind this issue is incorrect DNS settings in the browser. DNS (Domain Name Server) allows the site, SO it is necessary to connect with the proper DNS. Moreover, you are using an unreliable DNS. So always keep in mind to connect with the right DNS and if it is incorrect then you need to change it.
Blog: https://getassist.net/how-to-fix-safari-cannot-connect-to-the-server/