You could use port montior from system internal to see who has open session on 983? ports or you could do audit of the connection to the server. Please look in page 134.
Try going to Tools -> Administration -> Infrastructure Management in the Configuration Manager.
Then expand Application Servers and choose the one that you are interested in and expand it. Select Client Connection Service and this will show you a list of connections and the users logged in on the connections.
Note that each Configuration client session normally establishes about 4 connections to the app server.
Exactly what I was looking for. Thanks.