'Safari Can't Open the Page' covers DNS failures, server downtime, and network errors. Here's how to diagnose and fix it on iPhone, iPad, or Mac.
That site is either down or blocking Safari's user-agent.
Next step: Try the site in Chrome or Firefox. If other browsers load it and Safari doesn't, the site is filtering by browser. Report it to the site owner.
Safari has lost its network connection.
Next step: Toggle Wi-Fi off and back on. On iPhone/iPad: Settings → Wi-Fi → tap your network name → Renew Lease. On Mac: System Settings → Network → your connection → Renew DHCP Lease.
The update reset or changed your network settings.
Next step: On iPhone: Settings → General → Transfer or Reset iPhone → Reset → Reset Network Settings. (This clears saved Wi-Fi passwords — note them first.) On Mac, remove and re-add your Wi-Fi network.