Computer type problem

(Some web pages only!) Yesterday (Using same laptop) I could access a couple of other websites I use. Over a few weeks those websites were not accessible to me and I didn't understand why. Today those websites cannot be accessed from the same laptop. I get the following message;




I also use the Snap On website or at least I log in and read posts, however I also got a log in error there as well giving a different domain name than I was used to seeing from Snap On. I decided to contact them and they said they were aware of the problem and were resolving the issue. They emailed me yesterday and advised they had fixed it. I logged in and out a few times and it seems yes its fixed, however, the above message is still current for other forums.

Would this be a problem on my laptop or their sites?

I've cleared all browsing history and cookies. No change.

Any advice welcome.