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+---
+title: "DNS server issues"
+description: "More information on why issues with a DNS server marks the installation as unsupported."
+---
+
+## The issue
+
+Home Assistant requires a working DNS server to function. Without one it may be
+unable to provide functionality like checking and executing updates, showing
+documentation, reach external services required by add-ons and integrations, etc.
+
+## The solution
+
+The easiest solution is to re-enable the fallback DNS option by executing the following
+command in the CLI:
+
+```sh
+ha dns options --fallback=true
+```
+
+Alternatively review your system issues by executing the following command in the
+CLI:
+
+```sh
+ha resolution info
+```
+
+You will see one or more issues with a context of `dns_server`. For each such issue,
+take the following actions based on the issue type.
+
+### `dns_server_failed`
+
+1. Ensure the DNS server is operating normally
+2. Ensure the DNS server has internet access
+3. Ensure the hostname `_checkdns.home-assistant.io` is not blocked
+
+### `dns_server_ipv6_error`
+
+If you see this that means the application you are using for DNS is not handling
+A and AAAA requests correctly. You can test this by executing the following commands:
+
+```sh
+server="<IP address of DNS server>"
+dig "@$server" _checkdns.home-assistant.io +noall +comments +answer A
+dig "@$server" _checkdns.home-assistant.io +noall +comments +answer AAAA
+```
+
+A DNS server handling A and AAAA requests correctly will respond with status `NOERROR`
+for both of those queries even though there are no answers for the AAAA request.
+A DNS server mishandling this request will only return a `NOERROR` response for
+the first one and will return `NXDOMAIN`, `REFUSED`, `SERVFAIL` or some other error
+status for the second.
+
+It is important to use a DNS server that handles this situation correctly since
+Home Assistant uses alpine for many of its containers. Alpine follows the DNS spec
+and will treat the entire domain as if it can't be resolved if it receives an error
+status for either query. Home Assistant will run into many unexpected issues in
+this situation, particularly around updates and installing software.