Freebsd – How to get access to Icinga on Apache 2.4

Answering my own question after a lot of trial and error. This answer should apply to Apache >= 2.0.

In summary, it seems the Indexes option for the Options directive requires mod_autoindex. You can stop reading now unless you'd like more info on the default Apache behavior.

More Info

The key is whether or not mod_autoindex is loaded. If it's not loaded, setting Options -Indexes will have no effect and return a 404, which makes sense because the mod_dir DirectoryIndex directive can't find your index file. If it is loaded, setting Options -Indexes will return a 403.

This is somewhat explained in the Apache Options docs under Indexes, which is a little confusing because Options is a part of mod_core.

Indexes

If a URL which maps to a directory is requested, and there is no DirectoryIndex (e.g., index.html) in that directory, then mod_autoindex will return a formatted listing of the directory.

... and explained on the mod_autoindex page:

Automatic index generation is enabled with using Options +Indexes. See the Options directive for more details.

My tests indicate that enabling/disabling .htaccess files with AllowOverride is irrelevant.

This may well be a merging issue, details here: http://httpd.apache.org/docs/current/sections.html#merging

So in general the more specific configuration sections line Directory and Location location can override configuration at the Virtual Host level which in turn can override configuration at the global level. But when you get down to the more specific blocks of configuration, how they are handled in described in the link above.

These levels are called contexts in Apache terms and it is a really good idea to become familiar with what context means in this, er ... well ... context :-). More info here: http://httpd.apache.org/docs/current/mod/directive-dict.html#Context

As mentioned in the comments, look in the global context for Location, LocationMatch blocks that might match your URI path or Directory or DirectoryMatch that might match /home/test/ or anything above it in the directory tree.