REST Client is being rejected by PHP server running locally

I have a basic REST application running of PHP 5.4's internal server. I can access it in my browser just fine. However, I can't get the rest client to work with it. I get a connection time out message.

org.apache.http.conn.HttpHostConnectException: Connect to 10.0.2.2:8081 [/10.0.2.2] failed: Connection timed out: connect

It is running on localhost:8081. Has anyone had this problem?