Specify Remote Folder - The specified path is not a remote shared folder

I'm getting this error when I try to check a backup stored on a NAS.  When I attempt to recover from it, I pick "A backup stored on another location" then "Remote shared folder". 

I put in the path: \\192.168.16.17\public\server\2014-01-24

And what I get is the above error message: "The specified path is not a remote shared folder"

The path clearly is a remote shared folder. If I paste it into explorer it opens fine, and I can copy/delete files from it.  What gives?