In order to allows ColdFusion showing its errors instead of just server error (code 500), I have added to web.config according to some findings in this site.
The pr
Keeping the passthrough in place, you could use a rewrite to handle the blank page:
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /404.cfm [NC,L,NS]
The rewrite basically means - if file and directory do not exist, redirect to "404.cfm. Also include a 404 cfheader on the 404.cfm page.