There are multiple reasons Home Assistant Cloud cannot be reached. This page provides instructions how to troubleshoot the "Unable to connect" message.

Message: "Unable to reach Home Assistant Cloud"

Symptom

Under System > Home Assistant Cloud:

• The Cloud connection status is Connecting…
• You see a message Unable to connect.

Cause

This error indicates a network issue. It often occurs when the Home Assistant host has a bad IPv6 network configuration. Fixing the network configuration or disabling IPv6 on the host should resolve this error.

Resolution

1. To check the IPv6 connection, in your browser, open test-ipv6.com.
   • Try the steps suggested by the website.
2. If there is an IPv6 issue and the step above didn't work: try disabling IPv6:
   • In the UI, go to System > Network.
   • Under Configure network interfaces, expand the IPv6 dropdown.
   • Choose the disabled option and save the changes.
   • To have all network settings applied from scratch, reboot the host. Select Settings > System > Restart Home Assistant (top right) > Reboot system.

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