Hi @Rex_Noel,
Thank you for reaching out to demystify security concerns with ARC. To summarize what our moderators and other users have posted, there’s no risk posed by using ARC out-of-the-box for its intended use cases.
The thread listed above contains more thorough and clarifying posts from more senior developers and staff at Roon. If you require assistance with setting up ARC on your own local network, the tech support team will be happy to respond here. If you’d like to pose further questions concerning UPnP, port forwarding, and network security, we’d be happy to move this to the #software section.