I had to try the "Forum Log-In" four times before my log-in went through.
In case of severe failure causing problems on millions of peoples' computers, then, at least, the avast! homepage should have a message on it.
A good message to put on the homepage would include: The update servers are having problems; the symptoms include users' avast! clients to periodically pop up and complain about not being able to connect; and a suggestion to please check the homepage again later when an ETA for repairs will be announced.
Right there on the homepage -- the first place most people will look for answers.
Then, people will know that the problem isn't in their own computers. "Less communication" increases the anger. "More communication" reduces the anger. So, make an effort.
People shouldn't have to drill around the website and rummage through the forum, and read through to Page 3 to find out that the problem is being addressed. You could put a message on the homepage. Communicate with your millions of users instead of hiding.