Azure网站使用MVC Identity 2.0登录后SSL/HTTPS异常求助

Hey there, let's break down why you're seeing that SSL lock warning only after logging in with MVC Identity 2.0—especially since your other Azure-deployed apps with the same flow work perfectly. Here are targeted steps to diagnose and fix this:

1. Check for Mixed Content #

The most common culprit here is mixed content: your post-login page is loading some resources (images, scripts, stylesheets) over plain HTTP instead of HTTPS.

• Open your browser's DevTools (Ctrl+Shift+I or Cmd+Opt+I on Mac)
• Switch to the Security tab: it'll explicitly flag any non-HTTPS resources triggering the warning
• Check the Console tab too—you'll see error messages like "Mixed Content: The page at 'https://...' was loaded over HTTPS, but requested an insecure resource 'http://...'."

2. Verify Identity Redirect & Callback URLs #

Double-check that all Identity 2.0-related redirect paths use HTTPS:

• In your Startup.Auth.cs file, look at configurations like CookieAuthenticationOptions's LoginPath, LogoutPath, and ReturnUrlParameter—ensure they're using absolute HTTPS URLs (or relative paths that resolve correctly over HTTPS)
• Confirm that any custom redirect logic (like AuthenticationManager.RedirectToLogin) isn't hardcoding HTTP links, especially if you're using environment-specific settings

3. Validate Azure App Service SSL Settings #

Even if you have SSL enabled globally, this specific site might have misconfigured settings:

• Go to your Azure App Service portal -> TLS/SSL settings
• Make sure HTTPS Only is set to On—this forces all traffic to use HTTPS
• Verify your HTTP to HTTPS redirect rule is active (you can check this under Configuration -> Rules) to ensure post-login redirects aren't falling back to HTTP

4. Ensure Authentication Cookies Have the Secure Flag #

MVC Identity 2.0's auth cookie should be marked as secure, so it only travels over HTTPS. If this flag is missing, it can trigger warnings or expose the cookie unnecessarily:

• In Startup.Auth.cs, update your CookieAuthenticationOptions to include:

  app.UseCookieAuthentication(new CookieAuthenticationOptions
  {
      // Other settings...
      Cookie = new CookieBuilder
      {
          SecurePolicy = CookieSecurePolicy.Always
      }
  });
  

• For older Identity 2.0 setups, you might use CookieSecure = CookieSecureOption.Always instead

5. Check Page Meta Tags & Refresh Logic #

Look for any meta tags that might be forcing HTTP resources or redirects:

• Search your post-login views for <meta http-equiv="refresh"—ensure the target URL is HTTPS
• Check for <meta http-equiv="Content-Security-Policy" rules that might accidentally allow HTTP resources (though this is less likely if the initial load works)

6. Review Third-Party Login Providers (If Used) #

If you're using external login providers (Google, Facebook, etc.), confirm their callback URLs are set to HTTPS in both your app's configuration and the provider's dashboard. A misconfigured callback could redirect back to HTTP after authentication, triggering the warning.

If none of these steps resolve the issue, sharing specific error messages from your browser's DevTools or snippets of your Startup.Auth.cs configuration would help narrow things down further!

内容的提问来源于stack exchange，提问作者Phil Scott