Indexing files on remote server

I am trying to create a verity collection that indexes a share on a remote
server.  (We have a front end webserver, and a static data server
 - I am trying to index files on the static server, via a UNC path)

I believe the systems are set up properly in regards to the user which the
CF services are running as having proper permissions to the share.

I can successfully create files on the remote server using CFFILE from the
webserver using the same UNC path - so I would think that the verity
indexer would be able to read those files.

Here is the exact tag I use:
      <cfindex collection="#variables.collection_name#"
            action="update"
            type="path"
            key="\\Server\Path\To\My\Files"
            extensions="#application.inc_index_extensions#"
            recurse="yes">

When I change the "key" attribute to some local drive\directory
(like "D:\cache\0000\Docs") it works just fine.

Am I forgetting something?

Thanks in advance.