Definition
An unknown host is an error message that displays when a device fails to detect another system’s domain name or hostname. It usually happens due to DNS misconfiguration.
Because the unknown host is not a security threat, cyber criminals mainly exploit the DNS misconfiguration to attack the users’ devices. In such cases, users must instantly remove the data breach to protect their sensitive data, including financial information, bank accounts, and login credentials.
When Does an Unknown Host Occur?
- Erroneous hostname: If a user misspells the hostname or is otherwise wrongly entered, the DNS fails to resolve it.
- DNS server problems: The DNS server may face issues or temporary outages.
- Connectivity issues: If the user experiences connectivity problems, such as misconfigured network settings or a poor web connection, it may affect the DNS resolving process.
- Non-existent or expired domain: The domain the user attempts to access may have been removed or expired, implying the DNS system no longer holds it.
How to Resolve an Unknown Host
- Double-check the hostname for correct spelling, completeness, and typos.
- Inspect for and resolve connectivity problems on your network or device.
- Try accessing the domain from a different network or another device.
- Clear DNS to fix issues linked to outdated or stale DNS entries.
- Alter your DNS server if you suspect the problem is related.
- Make sure your system’s host file includes no outdated or inaccurate entries.
- Review security and firewall settings to ensure your measures don’t restrict access to the domain you’re attempting to reach.
- If everything fails to work, contact your network administrator or Internet Service Provider (ISP).