Safari Can't Open The Page? WHY?

Richard Schwager wrote:

This is happening to all of my websites. I can open them in Chrome, Firefox & Edge. It must be a setting on Safari, but which one?

All of your own websites, or all websites everywhere?

Have you possibly modified the Safari WebKit feature flags? If so, reset all to defaults. (On recent iPhone and iPad versions that’s at Settings > Safari > Advanced > Feature Flags, and scroll to the bottom of the list of flags. There are similar feature flags settings for macOS, but I don’t have anything running macOS 10.13 handy to check where that reset and that feature setting list is within Safari’s settings.)

Any add-on browser extensions, or any ad-blocking extensions, or add-on VPN apps, or add-on security apps, or other related installed on macOS? If so, disable and remove all of that per vendors’ instructions, restart the Mac, and try the connection again.

if this is happening on your own websites, log into your server and look in your server logs, as a starting point. Websites range from trivial static HTML to vastly complicated affairs that download immense piles of JavaScript, ECMAScript, or WebAssembly code that runs locally in the web browser. See if the connections are reaching the web server and not some caching server or CDN or middlebox, and what messages are arising in the logs.

If you’re really on macOS 10.13, that’s quite old, and can have issues making secure network connections. If higher security is required for these website connections, does connecting from something running more recent macOS work?

That error message means the website or its network connection is overloaded or under-configured, or maybe is failing, and is unable to serve the website content expeditiously.

For some hypothetical restaurant has an immense line waiting, and there’s not enough tables and not enough staff and not enough cooking equipment available at the restaurant, so some folks that might want to visit the restaurant, well, can’t.

If the website problem does not resolve after an hour or a day or so, you will want to discuss the website performance issues with the organization maintaining the website.

Richard Schwager wrote:

I am using 14.2.1 the problem started when I upgraded I am on A Mac Mini not an iPad or an iPhone, so the instructions about iPhones & iPads don't apply.

Clear cookies and cache for Safari, please remove any first-few-hops VPN client app, any add-on security apps, add-on cleaner apps, or similar tooling, all of it, per the vendors' instructions, restart, and try again.

I am using 14.2.1 the problem started when I upgraded I am on A Mac Mini not an iPad or an iPhone, so the instructions about iPhones & iPads don't apply.

This is happening to all of my websites. I can open them in Chrome, Firefox & Edge. It must be a setting on Safari, but which one?