I installed Avast Premium Security yesterday and had problems making a final connection using Echolink
Previously Echolink was performing fine, and I had port forwarding set up for the ports Echolink uses.
I am using Echolink version 2.0.908 and when connecting to station they hear me partially connect, but I do not hear them and the final connection is not shown in Echolink.
I was able to solve this by adding going to Avast Application rules and changing inbound ports to All.