Well, that pointed out the basic information I needed, which is Firefox/ is the default User-Agent for the browser. So, I was able to add that one to the block list. Not saying they can't get around it, but it means they have to jump through one more hoop, and thereby making their attempts deliberate acts of circumvention. Oh, and a search for User-Agents: on Google brought me to this site http://www.zytrax.com/tech/web/browser_ids.htm, which contains header information on LOTs of different browsers. ________________________________ From: Greg Mulholland [mailto:greg@xxxxxxxxxxxxxx] Sent: Thursday, March 17, 2005 22:17 To: [ISAserver.org Discussion List] Subject: [isalist] RE: ISAserver.org - Review of SurfControl Web Filter 5.0 for ISA Server 2004 http://www.ISAserver.org No worries. as in the doc you can edit the file and change the user agent manually or there are other options, i have a jpg but for the sake of the list ill just tell you thats its an dev plugin/extension which allows you to select the User agent for any browser you want..