Communication in tailnet

Communication in tailnet

Hello, everyone,

and I’m asking some of the advanced users to review this expert article. What brought me to it? I installed the Uptime Kuma application on an HA that is connected to the Tailscale network, and I was trying to monitor another remote HA (i.e. monitor its UP/DOWN status) that is also connected to the Tailscale network. However, Uptime Kuma was not able to reach the remote HA using <Tailscale_IP:Port_number>, presumably because it is separate from some of the Home Assistant Core layers - i.e., especially those that have tailnet access (at least this is my layman’s explanation of the problem - as I was not able to run monitoring using Uptime Kuma via tailnet even after installing it on the Synology NAS Docker).

Since I am a complete layman in network problems, would there be someone here on the forum who could review the mentioned article, or possibly try to prepare an understandable solution to the problem (ideally a step by step tutorial …)? Thanks a lot for helping me (and maybe other colleagues …).