I think this may help:
http://www.theserverside.com/discussions/thread.tss?thread_id=32410

Last answer:
The answer to this problem is simple and a bit strange

use headers in lowercase for firefox works in internet explorer too..

for example:

Response.AppendHeader("pragma", "no-store,no-cache") ' //HTTP 1.0
Response.AppendHeader("cache-control", "no-cache, no-store,must-revalidate, max-age=-1") // HTTP 1.1
Response.AppendHeader("expires", "-1")

Checked khtpd.c and indeed they are being sent nicely Capitalised...

I'll patch my kernel and try it...