Thanks mmadore, nHe managed to get the domain controller of the virtual machines to point at the same NTP as the license server (found it was originally pointing to the CMOS). Am having less issues, but they are generally the same (System Error 0 with attempt to checkout 10017) and one new one which I haven't seen before (Heartbeat) images from licdebug.DYNA_SOLVER.201.out:nCheers,nNathannnn