Got this from the IGate manager. Thanks to all who provided the pieces and clues needed so track this down.
Subject: Re: I-Gate
I see what happened. RK3KPK is a BBGATE user who frequently telnets or netroms into BBGATE. He's a curious follow who stumbled across the gateways RF port servicing the APRS packets on 144.390. That port has not, yet, been restricted. So, when rk3kpk checked the heard list on the port, he thought there were lots of keyboard stations available for contact. Ergo, he attempted to initiate a connection in hopes of chatting with a 'local' laptop or tnc. There's nothing clandestine about his activity. If anything, it's my bad for leaving that RF accessible to the general ham community. As it turns out, I believe he as been the only user who actually tried going out on that port to connect with INDIO or any other station listed on the APRS port heard list.
Good catch guys. 73, Jack