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Getting error "The request was aborted. Could not create SSL/TLS secure channel"

Getting "The request was aborted.  Could not create SSL/TLS secure channel" error all of a sudden.  What has changed?  Was working good before.


I'm using the API to run transactions from a WinForms application.






The error message "The request was aborted. Could not create SSL/TLS secure channel" typically occurs when there's an issue establishing a secure connection via SSL/TLS. This can happen for several reasons, and here are some steps you can take to troubleshoot and resolve the issue:

1. **Check SSL/TLS Configuration**: Ensure that the SSL/TLS configuration on the server you're trying to connect to is properly set up and compatible with the client making the request. Sometimes, mismatched or outdated SSL/TLS versions or cipher suites can cause connection issues.

2. **Verify Server Certificate**: Make sure that the server you're connecting to has a valid SSL/TLS certificate issued by a trusted Certificate Authority (CA). If the certificate is expired, self-signed, or not trusted by the client, it can cause SSL/TLS handshake failures.

3. **Check Firewall and Proxy Settings**: If you're behind a firewall or using a proxy server, verify that they are not blocking or interfering with the SSL/TLS connection. Ensure that the necessary ports (e.g., 443 for HTTPS) are open and accessible.

4. **Update SSL/TLS Libraries**: Ensure that the SSL/TLS libraries used by your application or framework are up to date. Older versions of SSL/TLS libraries may lack support for newer encryption algorithms or security protocols, leading to connection failures.

5. **Check System Date and Time**: Ensure that the system date and time on the client machine are correctly set. SSL/TLS connections rely on valid certificate expiration dates, and an incorrect system time can cause certificate validation failures.

6. **Inspect Intermediate Certificates**: If the server is using an intermediate certificate, ensure that it is properly configured and accessible to the client. Missing or misconfigured intermediate certificates can cause SSL/TLS handshake failures.

7. **Enable Detailed Logging**: Enable detailed logging in your application or framework to capture more information about the SSL/TLS handshake process. This can help identify the specific stage at which the connection is failing.

8. **Test with Different Clients**: If possible, test the connection from different client machines or environments to see if the issue is specific to a particular configuration or setup.

9. **Consult Service Provider Documentation**: If you're connecting to a third-party service or API, consult their documentation or support resources for any specific SSL/TLS requirements or known issues.

10. **Contact Service Provider Support**: If you're still unable to resolve the issue, contact the service provider or server administrator for assistance. They may be able to provide further insights or troubleshoot the issue from their end.

By following these steps and investigating the potential causes of the SSL/TLS connection error, you should be able to diagnose and resolve the issue effectively.