[Admins]

You are using the default Windows firewall? There are some firewalls / anti-virus programs which silently block programs that have been updated or reinstalled. The best is then to check in the configuration of the firewall / anti-virus program if there is Graal listed somewhere, and then remove it (so that it will ask when you start Graal again) or change the options there directly.
I don't know of other reasons why the connection shouldn't work since you can access the forums without problems.