The current version (1.22) is not compatible with the previous versions of the game when playing via network. Both the server and client must have appropriate versions of the game (1.22) in order to connect.
NEW OPERATION FLASHPOINT VERSION 1.96 STANDALONE DEDICATED SERVER README
16th January 2004
The OFPR_Server.exe file will enable you to set up dedicat
This file is the Windows stand-alone dedicated server with readme, batch and configuration files included. This has been updated to address the crash issue from earlier. It requires a copy of the retail game to be installed.