So I dont think it is this, but it is the most likely reason so far, so I am going to investigate further. So I downloaded and installed Java8 to see if that was the issue thinking if I could get it to validate I will uninstall Java8 after validation and then install Java6, but unfortunatley with Java 8 installed it still did not validate.

I did notice that it requires Java 8 or later for TLS1.2 and I know CS6 requires Java 6. On the two differnt machines I am running Yosemite10.10 (test machine) on one and Sierra10.12 on the other and I am running Google Chrome 92.0 and Safari 12.12 on both of these machines. When I read into the info on the link you supplied, it says if affects OS 10.8 and before as well as differnt older web browsers. This is actually a really intresting read and the timing of being able to validated the serial number before and adobe turning inforcing TLS1.2 on Jdoes fit as I am only now experiencing this problem. I spent time on adobe chat last night and they even issued me a new serial number, but that didnt work either and now they wont talk to me in chat saying the product is no longer supported. The strange thing is that I reformatted a machine last month and its all OK. I also tried from home and through my phone just incase our work router, internet, virus protection software was casuing issues. I have tried this on both a Sierra and Yosemite Mac, both freshly reformatted and I get the same problem. If I hit retry it will come up with the same screen again and if I hit connect it will let me install and even run updates of the programs but won’t validate, which will only leave the software useable for 7days. When I try to validate the serial number it comes up with a “Please connect to the Internet and retry” error, saying it isn’t connected to the internet.

I cant get it to validate a legit serial number that is registered to my adobe account.

Has anyone else had trouble validating serial numbers during the install process of CS6 in the last week or so?

Adobe illustrator key generator cs6