I have started getting the above message again while using Thunderbird for reading newsgroups.
I have increased MaxConnections (MaxConnections=50) as suggested earlier, but this does not seem to make any difference.
This behaviour is very erratic - sometimes it works OK, and then it starts to fail. I have noticed that when I switch newsgroups then Avast! appears to start analyzing the messages from the previous group. All very odd.
Don.
Avast 4.6.614 and Thunderbird 1.0