Radarr App Networking Issues

[UKFlamingo]

Hello,

I am having an issue with the Radarr TrueCharts app not being able to connect to a remote download client. I shelled into the container and tried "nslookup remoteserveraddress" but it failed and couldn't return anything. I tested the same command from the TrusNAS shell and it worked perfectly fine. I do have a Pi-Hole setup but I set TrueNAS to use 1.1.1.1 / 1.0.0.1 as the dns server but the same issues persisting. What else can I try to get the app to connect to the remote server.

If it's worth noting, the remote server is working and I can connect to it from other radarr instances in a TrueNAS VM and on my personal PC.
I have tested the same commands on other containers. TrueCharts Sonnar works and provides the same response as TrueNAS. Prowlarr does not and shows the same as Radarr.

TrueNAS Response:

Code:

nslookup remoteserveraddress
Server:         1.1.1.1
Address:        1.1.1.1#53

Non-authoritative answer:
Name:   remoteserveraddress
Address: remoteserverip

Radarr Response:

Code:

nslookup remoteserveraddress
Server:         172.17.0.10
Address:        172.17.0.10#53

Non-authoritative answer:
*** Can't find remoteserveraddress: No answer

I'd appreciate any help you can offer on this.

Thanks