No Such Host Is Known SQL Server: Troubleshooting Steps for Devs

Hello Dev, have you ever encountered the error message “No such host is known” while trying to connect to your SQL server? Worry not, in this article we’ll be discussing possible causes of this error and steps to fix it. Let’s dive in!

What Is the “No Such Host Is Known” Error?

The “No such host is known” error occurs when the SQL server is unable to resolve the hostname specified in the connection string. This error can be caused by a variety of issues, such as incorrect DNS settings or issues with the network connection.

Common Causes of the “No Such Host Is Known” Error

Here are some common causes of the “No such host is known” error:

Troubleshooting Steps

Step 1: Check the Connection String

The first step in troubleshooting the “No such host is known” error is to check the connection string. Ensure that the hostname is spelled correctly and that the DNS settings are correct. If the hostname is an IP address, make sure it is correct.

If the connection string looks correct, try connecting to the SQL server using the IP address instead of the hostname. If this works, it’s likely a DNS issue.

Step 2: Check DNS Settings

If the connection string looks correct and you’re unable to connect using the IP address, check your DNS settings. Ensure that the DNS server is set up correctly and that the hostname is properly registered.

You can also try flushing the DNS cache by running the command “ipconfig /flushdns” in the command prompt.

Step 3: Check Firewall Settings

If the DNS settings are correct, the next step is to check the firewall settings. Ensure that the firewall is not blocking the connection to the SQL server.

You can also try temporarily disabling the firewall to see if this resolves the issue. If the issue goes away, you’ll need to set up an exception in the firewall for SQL server connections.

Step 4: Check SQL Server Configuration

If the firewall settings are correct, it’s time to check the SQL server configuration. Ensure that the SQL server is configured to accept incoming connections and that the necessary ports are open.

You can also try restarting the SQL server service to see if this resolves the issue.

FAQ

What Is a Connection String?

A connection string is a string of information that tells an application how to connect to a database or other data source. It contains information such as the server name, database name, and login credentials.

Why Am I Getting the “No Such Host Is Known” Error?

You may be getting the “No such host is known” error for a variety of reasons, such as incorrect DNS settings or issues with the network connection. Follow the troubleshooting steps in this article to fix the issue.

What Should I Do If None of the Troubleshooting Steps Work?

If none of the troubleshooting steps in this article work, you may need to contact your IT department or the vendor of the SQL server software for further assistance.

Can I Prevent the “No Such Host Is Known” Error?

You can prevent the “No such host is known” error by ensuring that your DNS settings are correct, your firewall settings allow SQL server connections, and your SQL server is configured correctly to accept incoming connections.

Conclusion

We hope this article has been helpful in troubleshooting the “No such host is known” error when trying to connect to your SQL server. Remember to check your connection string, DNS settings, firewall settings, and SQL server configuration when encountering this error. Happy coding, Dev!