NIS 2010 Firewall stops Firefox from loading some sites like MySpace.com

I do not use Myspace.com but it is a URL that I can give as a site that fails with Firefox 3.6.7 every time. IE8 is OK. If I turn off the NIS firewall, it loads, as it does in IE8. I do not care about myspace as I do not even have an account, but a few of my other sites give the following error as well.

 

Bad Request


HTTP Error 400. The request is badly formed.

 

I looked at the options for the NIS Firewall but can not find any that seem as though I should change it. Any idea what may be on in the Norton Firewall that should be changed?

 

TIA