@BritG1 

Hey there. When this message is returned by your web browser, it typically indicates the server/website you are trying to reach (in this case, your digital music media storage device) is:

1. Being accessed using an insecure protocol (HTTP instead of HTTPS), so the browser prompts the message.

2. Missing an SSL Certificate or using one no longer considered "current" or "valid" by your web browser.

The latter is more common in local network server devices, such as the web management interfaces for routers, access points, and media sharing devices/NAS. Unlike websites that are hosted online, your local media storage device's server is not hosted online. For example, it may have a secure but outdated SSL Certificate issued at manufacturing or during a firmware update. As a result, a web browser may not see it as "valid."

However, if the local server device has no SSL Certificate to begin with, then point #1 would be the likely reason.

That said, since this device is behind your router and you are accessing it from another device/browser within the same LAN, there should be no cause for concern since none of the communication between the devices would be web-facing.

The router (Deco) on your network is not directly involved in the SSL handshake, as the handshake happens between your browser (PC, etc.) and the server (NAS, etc.)

If you're still unsure about the error message, I'd recommend contacting the manufacturer of your digital music media storage device. They should be able to provide further information and guidance.