Error 1460 Timeout on ISA 2004?

Recently I've been getting into ISA Server 2004 as we begin to rollout Service Pack 1 of SBS 2003 to all of our clients. One thing that we were getting and you should take a look at is the timeout settings for the web proxy. We were consistently seeing timeouts for clients with web searches on vendor websites that were in excess of 2 minutes. They would get an Error 1460 in their browser from ISA about a timeout on the firewall. Here's a fix we found:

In the console tree of ISA Server Management, click Networks.
In the details pane, click the Networks tab, and then click the applicable network. On SBS this is labeled "Internal" by default.
On the Tasks tab, click Edit Selected Network. (This is a little confusing. Just right click and go to Properties.)
On the Web Proxy tab, click Advanced.
In Connection timeout, type the number of seconds before ISA Server disconnects an inactive user.

Hopefully that'll correct that nasty 1460 error.