Computer Detected without Symantec Client Software

We have just upgraded our SEPM to v12.1 and since then we keep getting an alert saying "Computer Detected without Symantec Client Software" for a computer that does not exist on the network. We keep getting about 15-20 of these alerts a day for the same computer (IP address) but it is not on the network.
Any ideas?
ModernITSupportAsked:
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Ehab SalemIT ManagerCommented:
Configuring Unmanaged Detector:
http://www.anti-malware.ru/pda/index.php?act=attach&type=post&id=3530
Execlude MAC Address on Page 5


or
http://www.symantec.com/business/support/index?page=content&id=TECH95592

To reset all warnings, cancel the unmanaged detector and re-enable it.
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Ehab SalemIT ManagerCommented:
I was getting same and found that this is the console of one of the servers.
Can you ping this IP? is it in your subnet?
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ModernITSupportAuthor Commented:
No I cannot ping the address which is in the same subnet. I also checked the MAC address and cannot find that in the DHCP either.
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Ehab SalemIT ManagerCommented:
chekc the MAC address' manufacturer on:
http://aruljohn.com/mac.pl 
and enter first 6 digits of MAC address
It might give you a key..
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Ehab SalemIT ManagerCommented:
By the way, SEP is not clearing the unknown IPs even if it no longer exists.
I remember there is a way to reset detected computers without SEP.
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ModernITSupportAuthor Commented:
That would be very useful if you could let us know how to do that.
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ModernITSupportAuthor Commented:
I checked the MAC address and it came up with AMERICAN POWER CONVERSION CORP. So looks like a UPS someone on the network. How do I stop SEPM from throwing out this alert?
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Ehab SalemIT ManagerCommented:
Just add this MAC address to the exception list
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ModernITSupportAuthor Commented:
sorry but where do you add a MAC address exception in SEPM? I have looked but cannot find where to add it.
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Ehab SalemIT ManagerCommented:
Were you able to solve your problem?
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