Updated: The issue has now been resolved!
Outdated:
Due to a communication error on the part of our hosting provider, the security certificates for the heroesandgenerals.com domain have been allowed to expire, which causes annoying warning pop-ups to appear, both when viewing the website and when logging in to the game (because the welcome screen tries to load images from our website).
We are working on resolving this issue as soon as possible. Sorry about the inconvenience!