Debug log?

I'm working on a problem where one cell phone cannot connect to my
server using HTTPS. It can connect to the same pages using HTTP, and
lots of other phones can connect using HTTPS. I suspect it is a MIME
type setting issue, maybe for *.cer files?

Anyway, what I'd love to see is a log of the headers sent in the
request, and also the reply from IIS. Is there a way to log this?

For HTTP I'd just use netmon.exe, but HTTPS is encrypted, so I can't
tell what is going on.