If you want the lights to work properly, you will need to launch the game using this batch file every time.
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Optionally disabling any other anti-virus software and firewall at the same time can help for better game stability and to alleviate the issue Optionally try changing LanServerMaxTickRate=30 in Splinter Cell Chaos Theory\Versus\System\default.ini. For some completely uninstalling NOD32 solved the problem. No real fixes have been reported that work for everyone. In subsequent missions it seems to happen randomly after some time. The issue can be encountered 100% during the training mission while hacking the first laptop the players come across. There is an issue for some users happening at random after a couple of minutes where the game disconnects both players while playing the co-op campaign.