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Everytime I log in, my Norton 360 firewall tells me that Rule "Default Block UPnP Discovery" blocked (, Port ssdp (1900) inbound UDP packet. is the IP address of Orange Livebox through which I connect to the internet. First, what exactly is a UDP packet and, second, would it be too risky to disable the Rule to find out? Thanks in advance.

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  • John Hodgson Apr 30, 2010

    Thanks for your prompt comments. I think I will leave well alone!
    Best wishes


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UDP means "User datagram Protocol" in shortly. It is a protocol of communications. It offers a limited amount of service when messages are exchanged between computers in a network that uses the Internet Protocol (IP).

It is an alternative to the Transmission Control Protocol (TCP). UDP uses the Internet Protocol to actually get a data unit (datagram) from one computer to another.
UDP provides port number to distinguish different user requests and verify that the data arrived intact.

I advice you not to disable if you have Norton Internet Security Software packet. I also use Norton and I prefer not to disable it.

Hope this helps.

Posted on Apr 30, 2010

  • Ibrahim OKTAY
    Ibrahim OKTAY Apr 30, 2010

    But I noticed that you ask if it is too risky to disable it or not. Norton uses the also TCP protocols, thats why if you disable the UDP protocol it will not be too risky as you may think.

    (But I don't prefer as I said)

    Good luck.


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