Try installing or reinstalling IMPULSE and updating SINS from there. Be sure to execute the IMPULSE.exe programe after it downloads as it may be going to your temporary folder
I got the same thing and first tried well over a week ago. When 1st creating ICO account, get "disconnected from ironclad online" after entering name, password, and CD Key. downloaded updates. PC requirements fine, and residential gateway/Windows Vista walls are temporarily open.