Windows 8 and 8.1 Forums


"Unknown PC or device detected"

  1. #1

    "Unknown PC or device detected"


    I'm not truly the best with computers, and this is a new pop up for me. I just purchased this new dell laptop in May and have had no problems with it. However, in the last few weeks I've been getting a new pop up in the right hand corner. My house hold have a wireless router that is password protected. I have McAfee Security Center updated, and shows that all my firewalls and security systems are on and active.
    However, this is the message I get and I'm concerned about my networks safety:
    "Unknown PC or device detected
    This PC or device has connected to your network:
    IP Adress xxxxxxx"

    I've opened my action center to make sure everything is okay, and the only thing I find that isn't turned on is the "Network Access Protection" - which is something I haven't touched before, nor does it provide a link in which to turn it on. However, in browsing other forums I've found that everyone says turning it on isn't necessary or important.

    Looking for help on my issue, and would like to know if the message I'm getting means my computer is at risk.
    Thank you in advance!

      My System SpecsSystem Spec

  2. #2


    Posts : 2,191
    Windows 8.1


    Hmmm... since no one has responded yet, I'll ask a few questions. So, are you using a router and a wireless connection to access the internet? If so, have you set up router security so a password is always required for anyone trying to gain access? Also, can you go here and do this simple test to see if you have any open ports that are vulnerable to inbound intrusion attempts? Here's the link and here's my results:

    https://www.grc.com/x/ne.dll?bh0bkyd2

    Click image for larger version
      My System SpecsSystem Spec

  3. #3


    England, Northamptonshire
    Posts : 536
    Windows 8.1 Pro 64-bit ; Windows Server 2012 R2 Standard


    Quote Originally Posted by Loudstaticxx View Post
    I'm not truly the best with computers, and this is a new pop up for me. I just purchased this new dell laptop in May and have had no problems with it. However, in the last few weeks I've been getting a new pop up in the right hand corner. My house hold have a wireless router that is password protected. I have McAfee Security Center updated, and shows that all my firewalls and security systems are on and active.
    However, this is the message I get and I'm concerned about my networks safety:
    "Unknown PC or device detected
    This PC or device has connected to your network:
    IP Adress xxxxxxx"

    I've opened my action center to make sure everything is okay, and the only thing I find that isn't turned on is the "Network Access Protection" - which is something I haven't touched before, nor does it provide a link in which to turn it on. However, in browsing other forums I've found that everyone says turning it on isn't necessary or important.

    Looking for help on my issue, and would like to know if the message I'm getting means my computer is at risk.
    Thank you in advance!
    Open a command prompt and ping the IP address stated.

    Once done enter the following command and retrieve the MAC address.

    Code:
    arp -a
    For example if the IP address was 192.168.0.1 then I can see that the MAC address of that device in the arp table.

    Click image for larger version

    From here log on to your routers settings and see where this MAC address is coming from. Is it wireless or wired? What is the hostname (if any)? Do you recognise it?

    Josh
      My System SpecsSystem Spec

"Unknown PC or device detected"
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