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How do I fix the HTTP 501 error?

Alton Alexander
By Alton AlexanderUpdated on June 3rd, 2022

The HTTP 501 Not Implemented error message is a server-side error that indicates the server does not support the requested functionality. This is usually due to the server not being configured to handle the request, or the request being an invalid request.

Other common searches for this error include:

  • 501 error code
  • http 501

1. Change the CGI script

There are a few different things you can try to fix the issue:

  1. Check your server's configuration and ensure that the CGI script is being executed properly.
  2. Make sure that the CGI script is properly configured and that the required parameters are being passed to it.
  3. Check the script's syntax and make sure that all required parameters are being included.
  4. Verify that the script is being executed properly by trying to access the page using a web browser.
  5. If the script is being executed properly, then check to see if the issue is related to the content of the script itself or to the website's design.

2. Change the client browser

Open the Windows Control Panel and select System and Security. Click on Internet Options. Under the General tab, click on the Advanced button. In the Advanced Internet Options dialog box, click on the Settings button. Under the Security section, click on the Internet Protocol Version 4 (TCP/IPv4) section. Click on the Properties button. Under the Connections tab, click on the Advanced button. In the Connection Properties dialog box, click on the Settings button. Under the Security section, click on the Internet Protocol Version 4 (TCP/IPv4) tab. Under the Local Area Connection heading, click on the Properties button. In the Connections tab, click on the Security tab. Under the Security heading, click on the Properties button. Under the Local Area Connection heading, click on the Properties button. In the Connections tab, click on the Security tab. Under the Security heading, click on the Properties button. In the Security Settings dialog box, click on the Edit button. In the Edit Security Settings for TCP/IPv4 dialog box, click on the OK button. In the Local Area Connection Properties dialog box, click on the OK button. Close the Internet Options dialog box and the System and Security dialog box. Restart the computer.

3. Change the client operating system

Step 1: Boot the computer into Safe Mode with Networking To boot the computer into Safe Mode with Networking, press the F8 key repeatedly until you see the Windows Advanced Option Menu. From the Advanced Option Menu, select Safe Mode with Networking. Step 2: Open the Command Prompt To open the Command Prompt, press the Windows key and R at the same time. This will open the Run dialog box. Type cmd into the dialog box and press Enter. Step 3: Change the client operating system To change the client operating system, at the Command Prompt, type cd c:\ and press Enter. This will take you to the C:\Windows\system32\drivers directory. From here, you can change the client operating system by typing the following command: msiexec /a {path to the installer} For example, if you want to install the Windows 10 Anniversary Update, you would type msiexec /a c:\Windows\system32\drivers\x64_microsoft-windows-windows-feature-update-10-14-2016-x64_en-us.msi.

4. Change the network configuration

  1. Open the Network and Sharing Center by clicking the Start button and typing "Network and Sharing Center"
  2. Click on the "Manage Network Connections" button.
  3. Select the connection you want to modify and click on the "Properties" button.
  4. In the "General" tab, under "Network Protocols", click on the "Change" button.
  5. Select "HTTP" from the "Protocols" list and click on the "Change" button.
  6. In the "Host" field, type the address of the server that you are trying to reach.
  7. In the "Port" field, type the port on which the server is listening.
  8. Click on the "OK" button to save the changes.