how do i fix this System error '80131509' The request was aborted: Could not create SSL/TLS secure channel. /webmain.asp, line 12670

you don't give enough information. common causes are:

• the called site is using a self signed certificate
• the called site requires a higher TSL version then the caller supports
• the called site requires a client certificate

Hi,

It seems that this is a SSL/TLS problem when making HTTPS requests to external APIs like FedEx.

The probable causes could be:

1. TLS Version Issues

• Problem: Your server may be using an outdated TLS version
• Solution: Ensure your code explicitly sets TLS 1.2 or higher

// Add this before making any HTTPS requests
ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12 | SecurityProtocolType.Tls13;

2. Certificate Validation Problems

• Problem: SSL certificate chain validation failing
• Solutions:
  • Update Windows and .NET Framework
    • Install intermediate certificates
      • Temporarily bypass certificate validation (testing only):

// Only for testing - NOT for production
ServicePointManager.ServerCertificateValidationCallback = 
    (sender, certificate, chain, sslPolicyErrors) => true;

3. Windows/Server Configuration

• Check Windows Updates: Ensure latest security updates are installed
• Enable TLS 1.2 in Registry (if Windows Server 2008 R2 or older):

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.2\Client] "DisabledByDefault"=dword:00000000 "Enabled"=dword:00000001

4. FedEx API Specific Issues

• Endpoint Changes: FedEx may have updated their API endpoints
• Authentication: Verify your API credentials are still valid
• Rate Limiting: Check if you're hitting API rate limits

Here's how you can attempt to troubleshoot this problem:

Step 1: Test Basic Connectivity

try
{
    ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;
    using (var client = new WebClient())
    {
        string result = client.DownloadString("https://www.fedex.com");
        Response.Write("Connection successful");
    }
}
catch (Exception ex)
{
    Response.Write($"Error: {ex.Message}");
}

Step 2: Check TLS Configuration

• Use online SSL checkers (SSL Labs) to verify FedEx endpoint requirements
• Ensure your server supports the required TLS version

Step 3: Update Your Code (Modern HttpClient approach)

// Modern approach using HttpClient
ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12 | SecurityProtocolType.Tls13;

using (var client = new HttpClient())
{
    client.DefaultRequestHeaders.Add("Content-Type", "application/xml");
    
    try
    {
        var content = new StringContent(xmlRequest, Encoding.UTF8, "application/xml");
        var response = await client.PostAsync("https://fedex-api-endpoint", content);
        
        if (response.IsSuccessStatusCode)
        {
            string result = await response.Content.ReadAsStringAsync();
            // Process result
        }
    }
    catch (HttpRequestException ex)
    {
        // Handle SSL/TLS errors
        Response.Write($"Request error: {ex.Message}");
    }
}

Step 4: Alternative with WebRequest

ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;

try
{
    HttpWebRequest request = (HttpWebRequest)WebRequest.Create("https://fedex-api-endpoint");
    request.Method = "POST";
    request.ContentType = "application/xml";
    
    using (StreamWriter writer = new StreamWriter(request.GetRequestStream()))
    {
        writer.Write(xmlRequest);
    }
    
    using (HttpWebResponse response = (HttpWebResponse)request.GetResponse())
    using (StreamReader reader = new StreamReader(response.GetResponseStream()))
    {
        string result = reader.ReadToEnd();
        // Process result
    }
}
catch (WebException ex)
{
    Response.Write($"Web exception: {ex.Message}");
}

Step 5: Check Server Environment

• .NET Framework Version: Ensure you're running .NET 4.6+ for better TLS support
• Windows Version: Older Windows versions may need registry changes
• Firewall/Proxy: Verify no network restrictions

Step 6: Implement Proper Error Handling

try
{
    ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;
    
    // Your FedEx API call here
    
}
catch (WebException ex)
{
    if (ex.Status == WebExceptionStatus.SecureChannelFailure)
    {
        Response.Write("SSL/TLS Error: " + ex.Message);
        // Log additional details
    }
}
catch (Exception ex)
{
    Response.Write($"General error: {ex.Message}");
}

Quick Fixes to Try

1. Force TLS 1.2: Add ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12; in Application_Start() or before API calls
2. Update .NET Framework: Install latest version (4.8 recommended)
3. Check FedEx Documentation: Verify current API endpoints and requirements
4. Test with Postman: Confirm the API works outside your application
5. Review Recent Changes: Check if FedEx updated their security requirements

Hope this helps