Next Cloud Setup Issues

We are currently trying to setup a nextcloud solution for one of our customers. Unfortuantely we are having a couple of issues due to not being able to connect the machine to the internet. I suspect this is due to incorrectly configured DNS/Proxy server within nextcloud.

Can you provide me with a guide for viewing/modifying the DNS/Proxy settings.

Many thanks,

Managed to resolve the DNS issues by following Currently having issues pointing the server to our internal proxy server. Without this we cannot get internet access to download updates/recieve AV definitions ect.