400 The Plain Http Request Was Sent To Https Port
The HTTP request was sent to a valid URL, but the connection was refused. This can happen when the server is not configured to handle HTTPS requests.
a few possible reasons why this error may occur:
* The SSL certificate on your server has expired or been revoked.
* The SSL protocol version required by the server is not supported.
* The HTTPS port (443) is blocked by a firewall or other security software.
How to resolve 400 HTTP errors with HTTPS
- Check your SSL certificate: Ensure it's valid and up-to-date. You can verify the status of your SSL certificate using tools like OpenSSL or Let's Encrypt.
- Verify the SSL protocol version required by your server: If your server supports an older version, you may need to upgrade. For example, if your server uses TLS 1.0 or TLS 1.1, it may not be compatible with HTTPS 1.1.
- Configure your firewall or security software to allow incoming traffic on the HTTPS port (443). You can do this by adding an exception in your router's settings or configuring individual applications and services.
To resolve these issues, you'll need to investigate your server configuration, SSL certificate status, and firewall/ security software settings. By following these steps, you should be able to identify the cause of the error and resolve it.
Additional resources