I've set up iprint at work and when I go to the ipp web page and attempt to install my office printer on my home PC the driver download fails with the following error:

iPrint Driver Install: The specified driver .inf key was not found in the section.
Error Group: iPrint Driver Install
Error Code: -16

When I'm inside the LAN the driver installs fine. I turned off IP filtering to see if the BM 3.8 firewall was blocking it but that didn't make any difference.

Any ideas?