127.0.0.1

[mikeo56]

I have Dell Dimesion 4600 with Win XP Home. I use Norton IS 2005. Norton gave a warning that another computer from address 127.0.0.1 was attempting to acess my PC with a Trojan Horse. I was not online and my PC is not on a network with another PC. I understand that 127.0.0.1 is basically, my PC.
Anyone shed more light on this? How can my PC try to contact itself, if that is what is happening, and be blocked by its own firewall? Can I list this adress in Norton's trused zone for networking without opening my PC to attack?

 

[Jasen]

127.0.0.1 is the local loopback, basically a "test" network connection that the computer can use to communicate to itself using IP protocols.
It's not routable, so another computer cannot reach you with that address. It should be in your trusted zone for things to work properly.
If Norton said that it detected a trojan from that IP, then your computer itself has the trojan it's talking about. Or it's just a false positive.