@oatwalker from those posts, I assume you installed mumble on the side on your Cloudron. While this might work, it could break on future updates as we cannot reliably test such setups. If you are interested, you might want to look into https://cloudron.io/documentation/custom-apps/tutorial/ to see how you could package mumble as a Cloudron app. Also the firewall would have been setup by the platform automatically then.
O
oatwalker
@oatwalker