Windows 7 machine unable to access web console while Linux and OSX machines can

[Pete Woods]

I'm having a great deal of trouble getting a Windows 7 machine to connect to a printer I'm sharing using CUPS. It's a Debian Lenny install, running version 1.3.8 of CUPS.

I've configured cupsd to allow anyone in the IP range 192.168.1.*, and as you'd expect it allows me to connect with machines in that range. So on my MacBook using any browser I can connect just fine and print, etc. The same for an Ubuntu machine.

However I'm trying to set up my girlfriend's Windows 7 machine to print to it now. It looks like it should be really easy, add new printer, put in the URL:
    http://greybox.lan:631/printers/hp-psc1317
but that fails.

If I try browsing to it in IE, Firefox or Chrome it just hangs forever. If I try and connect to the URL https://greybox.lan:631/printers/hp-psc1317 (with https) then I get certificate warning but after confirming that it's just like the plain http connection where it waits forever without any errors or timeout.

Here's the access_log in debug mode for a few attempts at different URLs.
http://pastebin.com/m77df7c

It seems to not try and get images or anything? Compared to a single connection attempt with my Mac:
http://pastebin.com/m5b9e1ba3

I'm kinda tearing my hair out here. I've found one other person with this issue:
http://www2b.abc.net.au/science/techtalk/newposts/725/topic725396.shtm

I'm starting to think it could be a firewall thing, but I tried turning that off on the Windows machine and it didn't help.

Any suggestions welcome!
-Pete