Seems like your vehicle mods are causing desync which prevents players from connecting to a mp session.
Tested in combination with the following mods:
angels: ores, pressuretanks, warehouses, infiniteores, petrochem, refining, melting; bergius process; bobassembly, bobconfig, bobelectronics, bobenemies, bobgreenhouse, bobinserters, boblibrary, boblogistics, bobmining, bobmodules, bobores, bobplates, bobsangelthon, bobtech, bobvehicleequipment, bobwarfare; bullet trails; data-raw-prototypes; daynightextender; eco trees; helmod; laser beam turrets; logistic train network; marathon; off grid effects; realistic power; rso; shiny bob; shuttletrain; smart display; smart trains; tank wagon; uranium power
