calibre-server setup help

[neek69]

I'm trying to set up Calibre Server on a headless Linux server. The server comes online and shows my library, but I'm getting the error:

Failed to load books from calibre library, with error:
Failed to communicate with "/interface-data/books-init?library_id=ebooks&sort=timestamp.desc&1584487140060", network error, is the server running and accessible?

I originally created the library on my Mac, and then moved the books and metadata to the linux machine. It seems the file permissions allow the user running calibre-server to read/write to the db and the book folders. No errors are printed to stdout (I'm running the server manually, so the errors are supposed to be written there).

thanks!