C#: The Request Was Aborted: Could Not Create SSL/TLS Secure Channel

This error message usually occurs when making an HTTPS request in C# and the server’s SSL/TLS certificate is not trusted or there is a mismatch with the expected certificate.

Here are a few possible solutions to resolve this issue:

  1. Check the server’s certificate: Verify that the server’s SSL/TLS certificate is valid and trusted. You can do this by opening the URL in a web browser and inspecting the certificate details. If the certificate is self-signed or from an untrusted authority, you may need to add it to the Trusted Root Certification Authorities store on your machine.

  2. Set the ServicePointManager properties: Try setting the SecurityProtocol and ServerCertificateValidationCallback properties of the ServicePointManager class before making the request. For example:

ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;
ServicePointManager.ServerCertificateValidationCallback += (sender, cert, chain, sslPolicyErrors) => true;

// Make your HTTPS request here

This code snippet sets the security protocol to TLS 1.2 and allows any certificate validation result. Be cautious when disabling certificate validation, as it could expose your application to security risks.

  1. Check proxy settings: If your application is behind a proxy server, ensure that the proxy settings are correctly configured in your code or system-wide. Improper proxy configuration can interfere with SSL/TLS handshake and lead to this error.

  2. Ensure the URL is correct: Double-check that the HTTPS URL you are trying to connect to is correct and reachable. A mistyped or unreachable URL could cause this error.

It’s important to note that the underlying cause of this error can vary depending on the specific scenario, so it may require further investigation to identify the exact issue.

About the Author Rex

I'm a passionate tech blogger with an insatiable love for programming! From my early days tinkering with code, I've delved into web dev, mobile apps, and AI. Sharing insights and tutorials with the world is my joy, connecting me to a global community of like-minded tech enthusiasts. Python holds a special place in my heart, but I embrace all challenges. Constantly learning, I attend tech conferences, contribute to open-source projects, and engage in code review sessions. My ultimate goal is to inspire the next generation of developers and contribute positively to the ever-evolving tech landscape. Let's code together!