Why No Server Side Sockets?

I was perusing the JBoss Remoting documentation and I am trying to understand the reason for bidirectional transport. The documentation states th开发者_运维知识库at there could be security implications to allowing the server to establish a socket with a client. I was wondering what some of these cases might be.

Thanks in advance...

They didn't want to give any help for writing trojan horses, worms, viruses, adware, malware, etc.

Most firewalls block connections that are not initiated by a machine on the inside. If JBoss tried to connect to a client, it would likely be flagged as malicious.