Hi Jaime,
Thank you for your tips, but it does not work for me.
I am whitelisting the TCP protocol for the following IP’s at the moment:
34.211.235.206
54.69.187.22
34.211.14.212
52.89.196.208
107.170.232.165
162.243.159.176
50.116.28.27
I am still getting the error message “Sorry, key validation server is not available”.
If I stop the firewall, everything works fine.
Any other IP or protocol?
Thanks,
Andreas