I'm afraid this is the first I've heard of a "ad2" flavoured Blosxom. Try dropping the "/+ad2" bit from the end of the URL.
As mentioned on EFnet #NetBSD,
OFInst (OrangeFlag Installer) is a GUI installer
for the NetBSD operating system. Its client/server structure is built
on a top of the RWE protocol, with which it can perform advanced remote installations.
See the
project homepage
for more information, including a bunch of interesting
screenshots
and a
NetBSD 4.0_BETA based Live CD for testing the installer.