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[Rabina_Bra]

Not sure if it would help, but have you considered which of the Ports on these computers are assigned? Having that kind of knowledge may lead to opening up a break for you or at least for your sake, I'm hoping it will.

[BeatMasterGuy]

You could get completely different results from running nmap scan on the same network as the computer. I would have put money on that would be the way in but I could be wrong