Скачать или смотреть Resolving the Curl Error: SSL Handshake Failure for Secure Connections

Discover how to fix the `Curl error: error:14077410:SSL routines:SSL23_GET_SERVER_HELLO:sslv3 alert handshake failure` issue by adjusting your cURL settings to support modern TLS protocols.
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Troubleshooting Curl Error: SSL Handshake Failure

If you’re working with PHP and cURL for making secure HTTPS connections, you might have encountered this frustrating error:

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This error typically indicates an issue with how cURL is handling SSL protocols. In this guide, we'll explore the root cause of this issue and provide a structured approach to resolving it.

Understanding the Error Message

This error message points specifically to a handshake failure during the SSL connection process. The most common reasons for this error include:

Using obsolete or unsupported SSL/TLS versions.

Misconfigured cURL options.

Server requirements for modern encryption standards.

Recognizing this is the first step in addressing the problem.

The Cause of the Problem: SSL/TLS Version Settings

In the provided cURL settings, there are specific options set that may be causing the handshake failure:

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Suboptimal Protocols

TLS 1.0 Support: The line curl_setopt($oCURL, CURLOPT_SSLVERSION, 4); forces the use of TLS 1.0, which is considered outdated and insecure.

Cipher Configuration: The use of curl_setopt($oCURL, CURLOPT_SSL_CIPHER_LIST, 'TLSv1'); restricts your cURL to an even older cipher suite, making it incompatible with many modern web servers.

Server Compatibility

In many cases, the server you’re trying to connect to will have dropped support for these older versions of TLS due to security concerns. For instance, using a constant like PRZELEWY24_TYPE to connect to przelewy24.pl might lead to a failure if this site now only supports TLS 1.2 or later.

Recommended Solutions to Fix the Handshake Failure

To resolve the Curl error: error:14077410:SSL routines:SSL23_GET_SERVER_HELLO:sslv3 alert handshake failure, consider these modifications to your cURL settings:

1. Remove Explicit Version and Cipher Settings

The best practice is to not explicitly set the SSL version or cipher list. By allowing cURL to use its defaults, it will automatically select the most secure and compatible options available for your environment.

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2. Ensure Secure Verification in Production

For security reasons, especially in production environments, do not set:

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Disabling SSL verification can expose your application to serious risks like man-in-the-middle attacks.

Example of Adjusted cURL Code

Here’s what the revised cURL snippet might look like without the problematic options:

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Conclusion

By making these adjustments, you should be able to overcome the Curl error: error:14077410:SSL routines:SSL23_GET_SERVER_HELLO:sslv3 alert handshake failure and ensure that your cURL requests are compliant with modern security standards.

Always remember to regularly update your cURL and OpenSSL libraries to stay protected against evolving security threats. If the issues persist, check the server's SSL/TLS configurations and ensure its compatibility with current standards.

For any further assistance, don't hesitate to reach out to community forums or seek professional guidance!