DWA Attachments Not Working Through VPN

I’m testing webmail access with both a R7 client and R8 client through a Juniper VPN with different results. I observed the URL string for the attachment download on the R7 webmail inbox started with the correct syntax (http://myjunipervpn/dominoservername/filename) while the R8 URL attempts to go directly to the domino server (http://dominoservername/filename). Since the domino server hostname does not have a registered DNS entry, the R8 download will always fail since the url it is attempting to access does not exist on the internet. It needs the VPN proxy before it in the URL to download properly, which the R7 inbox does. Again, the R7 webmail inbox correctly prefaces it with the VPN URL so something has apparently changed with R8. Is there a setting we can change on the R8 server?