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Are you using a Proxy server? Do you recognise the domain name?
Thank you for replying. I don’t know if I have a proxy server; all I’ve ever done is use my laptop at home, which is connected to my wireless router. I don’t know what my domain should be. As you can tell, I’m not very good with computers. 
A good first step would be to get in touch with our Customer Support team through the NIS 2008 Help & Support link. Or you can visit the below site to contact our free Customer Support:
http://www.symantec.com/norton/support/selectproduct_ts.jsp
If you have already done this and they could not resolve your issue, please let us know. If you try the Chat option, the Customer Support Team can establish a link to your system to review the issue. Thanks!
It doesn't have to mean anything.
Sometimes networks in the firewall are spilt into the regular network and the firewall network