To give a bit of context to my problem, we have a 3270 Telnet Emulator (WinVV) that connects to an HIS server that then connects to an SNA Server and eventually to an IBM mainframe. I now want to write an app that automates data retrieval and have chosen (not that there's much choice) to use the Jagacy library. Before I start coding I wanted to make sure it would work so fired up their telnet client product that uses their library and have run into some difficulties.
To try to diagnose why the connection to the HIS server was unsuccessful I ran wireshark to capture the network traffic whilst running the 2 terminal emulators. It seems that WinVV uses UDP to connect to the HIS Server and Jagacy uses TCP. I'm thinking this might be the problem. Does anyone know if HIS supports TCP?