Safari blocked?

Try double clicking the Home button or swipe up from the bottom of the screen and swipe Safari upwards. Go to Settings/Safari and clear History and Website Data. Open Safari and test.

Safari - Clear the history and cookies on your iPhone, iPad, or iPod touch.    

Safari website data on your iPhone or iPad - How to clear.    

Hello and welcome to Apple Support Communities NutmegFred,

We see that you're seeing a message when trying to use Safari. We'd be happy to provide you with some information that can help.

We weren't exactly sure which device you were using based on your post, so we are providing information for a Mac. If this is not the device you're using, reach back out.

Looks like you might be dealing with possible adware or malware the articles below can help, as well as using Malwarebytes.

Clear your browsing history in Safari on Mac

About pop-up ads and windows in Safari

Malwarebytes

Let us know how this goes.

Have a great day!