I am trying to: I see this message: Toolset plugin cannot connect to toolset.com - I copied this page over from another one, and changed the site key for it. But this connecting issue still appears.
I have another couple of reports about something similar, and I'm already looking into it.
I'll get back to you when I have some findings to share, but in the meantime you can disregard the warning as it should not affect the functionality of your site.
Simon, I raised this with the Installer team yesterday, and I'm not sure if they did something on our end, but when I check your site again now the warning message has disappeared, and the issue seems to have resolved itself.