Issue with accessing reverse proxy services on LAN - G34

Hello all, 

Odd one that I’m hoping people here can help me troubleshoot. I’ve got some services (Jellyfin, Nextcloud, etc) running on a home server behind a reverse proxy. Normally, I access these servers at [service].[mydomain].com. Currently, on my LAN, this is not working. If I try to access the services outside of my LAN at the reverse proxy domain, they are working, and if I access the services directly by IP and port, they are working on my LAN. However, within my LAN, they are not accessible at the domains. Since the services work and the reverse proxy works outside my network, it seems I’ve got an issue in the network itself. I’m using a SURFboard G34 which I’ve only had for a few weeks. I have looked in the router WebUI and nothing seems amiss, but I really don’t know what I’m looking for. Would appreciate any suggestions. Thanks!