Yes, indeed. I’ve noticed that it only happens when connected throught a corporative network and when connected at home (cable) everything seems to work fine.

So it points to proxy definitions which are correct! Some unfriendly network admins might have blocked Avast servers. Unfortunately their standard av solution is McAfee. Some traffic with “.cz” servers might made them nervous ;D when they checked logs, I suppose.

The proxy definitions we have allow all kinds of internet traffic except for messengers and internet FTP transactions. It works fine and worked normaly Avast updates several days before showing the “can’t connect…” message.