401 - Unauthorized access error

[Cantor, Scott]

>The handler locations are virtual, so there's no file to fix or directory
>to check, it's a server-space setting of some kind involving that URL
>tree.

The other thought would be the ISAPI extension permissions. Could be
that's being blocked, but that should be all or nothing. There is no
explanation for it picking some requests to let through and not others,
unless it's a true permissions matter where some clients are accessing it
with Windows credentials that it lets through and not others.

-- Scott