Rob Page wrote:
I've used this in the past to diagnose a similar sort of problem. It seems to work.
I installed this last night, but although it showed me the HTTP conversation for the current page I couldn't see how to get the details of the trail of redirects that got me there. That said I didn't try very hard, and I can't check right now as I'm on site checking my email via VPN, so it may be that I'm missing something obvious. Thanks for the pointer, I'll investigate further when back at my desktop.