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If the address looks very similar to your own address, you may wish to take this to your ISP and if this truely is a malicious attack the ISP make take some action against the offender.
You also may wish to configure a permanent block rule to prevent the offender from trying other attacks against your machine. Norton Internet Security should protect you but a proactive rule is even better protection.
I've had the same problem for the least week. When Norton recognizes the port scan it shuts off the port (i.e. my internet connection) for 30 minutes. Very annoying! It turns out though that the IP address that Norton is intercepting is my exact own IP address!!! I did a thorough deep scan of my hard drive and did not find any problems.
Have there been any automatic Norton or Windows XP updates recently that may be causing this? Any other ideas?
DavidB wrote:I've had the same problem for the least week. When Norton recognizes the port scan it shuts off the port (i.e. my internet connection) for 30 minutes. Very annoying! It turns out though that the IP address that Norton is intercepting is my exact own IP address!!! I did a thorough deep scan of my hard drive and did not find any problems.
Have there been any automatic Norton or Windows XP updates recently that may be causing this? Any other ideas?
Please take a look at the answer from Reese
David, your problem is different in that your own address is being detected and you are losing connectivity. What version (year) of product do you have? Have you installed any new software that uses the network on your system recently?
Wow! Tthanks for the quick reply. The problem is on my home computer and I'm at work now, but I'm pretty sure that I'm using Norton 2005.
The only significant change in the last few weeks that i can think of is switching from Outlook to Thunderbird for my email.
If all else fails, iIs there some way I can tell Norton to ignore threats from my own IP address? Thanks.
David
Please try to upgrade to the latest 2008 version. Maybe that solves some things
I was kind of afraid you would say that.... I just renewed my subscription for Norton 2005 a few weeks ago. Everything was working fine then. Now I wish I had upgraded instead of renewed.
Any other ideas of how to resolve this?
For all I know you can use your license foor the latest version as well. So no need to be affraid 
See this Post regarding Upgrades and Re-newals:
http://community.norton.com/norton/board/message?board.id=nis_feedback&thread.id=2267
For the time being, it is advised that you Block Access / (ingress) to Port:
~ T.C.P. 00023 (T.C.P. Port 23).
~ T.C.P. 004457.
This is a very basic question, but Sister Mary Martha always said there were no stupid questions, so I'm going ahead anyway.
My Norton has blocked the same attack twice a day for the last couple days. When clicking on advanced details I see that it is a Portscan with risk level Medium and there is even a number for the attacking computer. So.,...
1) Do i just have to accept that this attack will continue indefinitely?
2) If "we" know which computer is attacking "us" can't someone do something about it?
3) I spent more time than I ever have on Your tube looking at videos from Iraq, probable source where the attacker got my computer ID?
4) I am very glad I have Norton.
Sorry for basic questions.
Thanks in advance. RLPULPWOOOD
David, I would normally tell you to upgrade to the latest version but I think that the free upgrade with current subscriptions began with the 2006 products. The newer products have preventions in them to prevent your problem. You should be able to solve this though by going to the Advanced rules and creating a General rule similar to the Default Inbound Loopback or Default Outbound Loopback rules that you should already have. I'm not entirely positive that this will help,because the order of checking the rules vs port scans changed across a number of versions.
We just have to accept. These things happen. As long as Norton keeps blokking them you are safe