The Server Host Key is Not Cached in the Registry – A Comprehensive Guide for Devs

Hello Devs! If you’re reading this article, it’s likely that you’ve encountered the server host key not being cached in the registry error. This error can prevent you from connecting to remote servers and can be frustrating to deal with. But don’t worry – we’ve got you covered. In this article, we’ll take you through everything you need to know about this error, from understanding what it means to troubleshooting steps and FAQs.

What is the Server Host Key, and Why is it Not Cached in the Registry?

Before we dive into the specifics of the error, let’s first understand what the server host key is, and why it’s important. When you connect to a remote server via SSH or other protocols, the server sends a host key to your computer. This key is used to verify that you’re connecting to the correct server, and not a malicious imposter.

The server host key is not cached in the registry error occurs when your computer is unable to find the host key in its registry. This can happen for a number of reasons – for example, if you’re connecting to the server for the first time, or if the key has been deleted from the registry.

How to Troubleshoot the Server Host Key is Not Cached in the Registry Error

Now that we’ve defined the error, let’s look at some troubleshooting steps you can take to fix it.

Step 1: Check if the Server Host Key is Cached

The first step is to check if the server host key is cached in your computer’s registry. To do this, open your computer’s command prompt and enter the following command:

reg query HKEY_CURRENT_USER\Software\SimonTatham\PuTTY\SshHostKeys
Checks if the server host key is cached in the registry

If the server host key is cached, you should see a list of keys displayed in the command prompt. If not, move on to the next step.

Step 2: Connect to the Server and Cache the Key

If the host key is not cached, the next step is to connect to the server and cache the key manually. To do this, open PuTTY (or your preferred SSH client) and enter the server’s IP address or hostname.

When you connect to the server, you should receive a prompt asking if you want to cache the server’s host key. Select “Yes” to cache the key in your registry.

Step 3: Verify that the Key is Cached

After caching the key, verify that it’s been added to your registry. Use the command in Step 1 to check if the key is now listed.

Step 4: Clear your Cache and Retry

If the above steps don’t work, try clearing your cache and retrying the connection. To clear your cache, go to your PuTTY configuration, select “Connection,” and then “SSH.” Under “SSH Cache,” click on “Clear Cache.”

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Q1: What is the Registry?

A: The registry is a database that stores configuration settings and options for the Windows operating system. It’s used to manage system resources and ensure that applications and hardware components work correctly.

Q2: Can I Connect to a Server if the Host Key is Not Cached?

A: Yes, you can connect to a server even if the host key is not cached. However, this is not recommended, as it leaves your connection vulnerable to man-in-the-middle attacks.

Q3: What is PuTTY?

A: PuTTY is a free SSH and telnet client for Windows. It’s used to connect to remote servers and devices securely.

Q4: What is SSH?

A: SSH (Secure Shell) is a network protocol that allows secure remote access to a computer or server. It’s commonly used for remote management, file transfers, and other tasks.

Q5: How can I Improve Security when Connecting to Remote Servers?

A: There are several ways to improve security when connecting to remote servers, including using a VPN, using two-factor authentication, and regularly updating your server’s software and security patches.


And that’s it! We hope this article has helped you understand the server host key is not cached in the registry error and how to troubleshoot it. Remember, caching the host key in your registry is an important step in ensuring secure remote connections. If you have any other questions or comments, feel free to leave them below!