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...

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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.