I forgot a point in the list:
Upon installation, Umbrel utilizes Multicast DNS (mDNS) to be accessible throughout the internal network under the name "umbrel.local." However, it occasionally happens that, for some reason, it does not respond to that name, leading to past instances where I mistakenly believed the node was unresponsive and subsequently rebooted it. In reality, it is simply an mDNS issue within the internal network.
Therefore, if you encounter this situation, follow these steps:
  1. Access the Umbrel interface using the IP address rather than the DNS name (hence the importance of setting a static IP for the node).
  2. If this also proves ineffective, test the connection to the node via SSH.
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