Cannot connect to any VPN website

I have recently returned from a 2 week holiday and on my return I had a notification on my iMac of a software update which I installed and I am now running with Monterey Version 12.7.4 and Safari 17.4. For several years I have been running with Ivacy VPN, but when I tried to open this after the update I received a message in Safari advising "Safari can't open the page because Safari can't establish a secure connection". I also tried to open the website using google chrome with a similar result. I have tried some alternative VPN websites with the same result and I am not sure how I can fix the problem so any suggestions would be very helpful