Software⏱️ 3 min read📅 2026-06-19

How to Fix: 404 error - Finding what wasn't found with wireshark

Troubleshooting HTTP errors with Wireshark to identify missing requests.

Quick Answer: Use the 'HTTP Request' filter in Wireshark to analyze the request that failed with a 404 error.

📋 Table of Contents

  1. 🛑 Root Causes of the Error
  2. ✅ Best Solutions to Fix It
  3. 💡 Conclusion

A 404 error occurs when a user attempts to access a webpage or resource that does not exist on the server. This issue affects anyone using Wireshark to analyze HTTP traffic, as they may struggle to identify the specific request that resulted in the error.

Frustratingly, Wireshark's filtering capabilities can make it difficult to pinpoint the source of a 404 error. However, by following these steps, you should be able to determine whatrequest could not be found and take corrective action.

🛑 Root Causes of the Error

  • The primary reason for a 404 error is that the requested resource does not exist on the server. This can occur due to various reasons such as a typo in the URL, a deleted or renamed resource, or an incorrect file path.
  • An alternative reason for a 404 error is that the request may be blocked by the server's security settings or firewall rules. In this case, the issue may not be directly related to the requested resource, but rather to the server's configuration.

✅ Best Solutions to Fix It

Analyzing HTTP Traffic with Wireshark

  1. Step 1: Open Wireshark and select the capture file that contains the 404 error.
  2. Step 2: In the Capture Tree view, expand the packet that corresponds to the 404 error and look for the HTTP request.
  3. Step 3: Examine the HTTP request headers, particularly the 'Host' header, which specifies the requested resource. This can help you identify potential issues with the URL or file path.
  4. Step 4: Use Wireshark's filtering capabilities to narrow down the search for the problematic packet. You can filter by protocol (HTTP), layer (Application), or even specific fields like the 'Method' field.

Using DNS Resolution and Server Logs

  1. Step 1: Use a tool like dig or nslookup to perform a DNS resolution on the requested resource. This can help you determine if the issue is related to the server's DNS configuration or not.
  2. Step 2: Check the server logs for any error messages or warnings related to the 404 error. This can provide valuable information about what went wrong and why the request was not found.

💡 Conclusion

By following these steps, you should be able to determine what request could not be found in the case of a 404 error with Wireshark. Remember to analyze HTTP traffic carefully, use filtering capabilities effectively, and consider DNS resolution and server logs as additional resources for troubleshooting.

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