THANK YOU for your response. I'll try to be more clear...(sorry I wasn't in my initial post). On my mac book I'm running OS Monterey...using my Browsers, Google Chrome and Safari, I have NO PROBLEMS accessing any website. No warning, no nothing. I type in the URL and I get to the sites. On my IMAC 2017, I'm running Catalina 10.15.7, OUT OF THE BLUE my browsers are (pretty much) restricting me from getting to any site. Sites like Ebay, Craigslist, Amazon. I CAN get into sites like CNN, and MSNBC, and YAHOO work fine. Most if not all OTHER sites I get a THIS SITE CAN'T BE REACHED window. Up in the Search Bar I get a little EXCLAMATION POINT. When I click on it, it says...YOUR CONNECTION TO THIS SITE IS NOT SECURE. I'm thinking this is a 'browser issue' OR some kind of Network Connection issue? I'm connected to Wifi, so know I have a wifi connection. I keep going over and over and over my browser settings, extensions, privacy and security settings...I just don't know what to do. I've never had this problem before. Please let me know if I've been clear as to what I'm experiencing. Thank you so much. M