I've been using Agent to readnet Usenet groups for ages. I just downloaded and installed Avast, version 7.0.1407, and I get this error when trying to download new headers in Agent: Error reported by server 400. Cannot establish SSL with NNTP server 220.127.116.11:563, SSL connect error 38.
(I also had to disable web shields, because Firefox wouldn't connect to any web pages. Not impressed so far, I have to say.)
(also I hate the verification words -- making them non-human readable may make it hard for robots to fool the system, but at the cost of making it hard for humans as well!)