ISA 2004 Caching appears to be not working

I was working with MS tech support a few weeks back on a Web proxy problem.
We got that fixed but it looks like we might have created another problem.
On the date we fixed one problem, I've noticed that the date of the dir1.cdat
file in the urlcache directory has not updated. Can Web Proxy and caching be
tied together in some way? I've noticed on our internal network, enable web
proxy is enabled. On the localhost network it is not. Should it be enabled
on the localhost as well?

This also ties into a 502 error we started to get on the same day. We have
a UNIX server that goes out and pulls content from one of our vendors. Since
that day, it has been unable to get to the site to pull content. We keep
getting the following error msg: Error Code: 502 Proxy Error. The request is
not supported. (50)

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