[HECnet] Weird TCP/IP service problem

I've define a service to run a DCL script that runs some python. It works fine when one connection is made, but crashes the system (literally, it core dumps [or whatever the VMS word is]) on multiple connections. Here's the service definition: TCPIP> show service himsrv/full Service: HIMSRV State: Enabled Port: 11337 Protocol: TCP Address: 0.0.0.0 Inactivity: 5 User_name: HIMSRV Process: HIMSRVD Limit: 1 Active: 0 Peak: 1 File: DKA0:[HIMSRV]HIMSRVTCP.COM Flags: Listen Multi Socket Opts: Rcheck Scheck Receive: 0 Send: 0 Log Opts: None File: not defined Security Reject msg: not defined Accept host: 0.0.0.0 Accept netw: 0.0.0.0 sampsa <sampsa at mac.com> mobile +961 788 10537