We just moved our website from a dedicated server to AWS, I now have the message that says that there is a communication error with the Toolset servers. I found out that my site URL had changed, so I created a new site on my Toolset Account, unregistered my site and re-registered it and the message is still there.
I am also a WPML user, I did exactly the same for WPML and it removed the message immediately.
I just de-registered the site and registered it again with a new key, the key seems do be valid, no error message while validating the key, but I still see the warning message at the top of the page as well as in the plugins page.
I don't understand then why I have no problem with WPML which use the same mechanism for updates and communication with the servers. I tried desactivating Wordfence, my security and firewall plugin, but it didn't resolve the problem.
I did some other checks on the site and I see that your site is able to connect to Toolset.com
I was able to update your types plugin with no issues at all. Even able to re-register your site with a key I created. What i'm going to do now is to escalate this as an exception to see what our 2nd tier supporters can find.
Finally you will need to re-add your site key as I removed it to do a short test. The good thing is that your site is functioning as intended.
OK, I just re-entered my key, keep me informed of any solutions from your team. I am keeping the credentials open until I have further news on the issue so you can make more tests.