OK...got past that issue. I had to add /feed.php to the URL and now I get the catalog running off my synology NAS.
However...I'm using moon+ and I noticed that, while search works in FB Reader, it does not work in Moon+ when I point it to the COPS database. It works in Moon+ when I point it to the calibre content server on my desktop machine though.
Any suggestions as to whether there's a configuration needed or what I can tell the developer of Moon+ Reader?