Yes, we actually installed a remote printer on our web server and set it as default but it did not make any difference, the app still found no printers.
The web server is on an corporate network not a dmz.
We think we have found a workaround by building a continious query that loads a single report with the certificate records as pages (using a page break), the client can then use the built in print icon to select a printer and print them all in one go.
It still needs to be tested in a production environment.
Would be nice to have a batch print option. It is quite a common scenario so surprised MS have not included this option, this would make a very good product into an excellent one.