Cannot connect via ammy admin.

When trying to connect to a remote computer, Avast displays the message “Botnet.Blacklist”. I have been using this program since 2013 and never had any virus problems with ammy admin. I have tried adding tcp://136.243.104.235:443, 136.243.104.235:443 and 136.243.104.235 to the trusted list, but avast keeps blocking the connection. How to solve this problem?