In R5, they had added the following to their httpd.cnf file: ErrorPage multi /error.html.
This would cause the contents of error.html to be served up if a bogus filesystem URL was received (http://server/doesnotexist.txt).
This no longer works in ND6.
The fix submitted for this SPR requires the use of the following notes.ini: HTTPMultiErrorPage=/error.html.
This regression was introduced in 6.0.
This is fixed in 7.0.2