Getting this error in StealthAUDIT host.
Unable to detect MAC address. SendARP returned error code. 
That sounds like a bad NIC.
Also, i would try to issue the arp -a command (This gives a list of all the Mac addresses and their associated IP addresses.) and you should be able to match the MAC in question with the IP (IP of StealthAUDIT host) you are looking for ,checking to see if the MAC is listed next to an IP.
I would also look at the SWITCH ,MAC Address table or Forwarding Table in which switch stores that at which port which machine is connected by storing its physical address (MAC Address).
Better to involve your network team.
As The server I have added as Host and the Source Server are in different VLAN so 'arp-a' will not have entries of the Host. Not able to trace the solution if this issue.
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