I'm trying to connect to private Minecraft server and my Avast Premium Security firewall is blocking the connection. I've already allowed all connections for the launcher and Java, but it didn't help. Then I turned on logging everything and found out that the application whose connection is blocked in fact isn't Minecraft launcher or Java (javaw.exe), but something called 'System' in the log, it says 'Rule not found' and I can't configure it since there's no such application in the list of available ones. How to unblock it?