Ive only had this issue while the game is being updated :/ I hope we find the solution soon for you. Try making exceptions in your firewalls for the website if you've updated a virus datebase recently. Sometimes small time game websites are not well known so they are considered potentially malicious websites.

the power and costs of some weapons changed

The server was down and Liran restarted the server. so you should be able to play it now

I have the same problem during a long time. i find the connect error seems to be related with the time oclock everyday, but i dont know why.

I often can play this game at morning, about 3 hours. But at other time, i cannot connect with the server.