PKI Tutorials - Herong's Tutorial Examples - Version 2.03, by Dr. Herong Yang
Test with Second CA Certificate Disabled
This section provides a tutorial example on testing .NET program on HTTPS communication with the second root CA certificate disabled.
To understand why my .NET test program is still working on https://login.yahoo.com after I disabled the root CA certificate "DigiCert High Assurance EV Root CA", I used IE 8 to visit https://login.yahoo.com again.
1. Run IE 8 and go to https://login.yahoo.com.
2. View server certificate path:
GTE CyberTrust Global Root - The root CA certificate |- DigiCert High Assurance EV Root CA - An intermediate CA certificate |- DigiCert High Assurance CA-3 - An intermediate CA certificate |- login.yahoo.com - The Web server certificate
Do you see any differences comparing to the server certificate path before I disabled "DigiCert High Assurance EV Root CA"?
Server certificate "login.yahoo.com" has 2 valid certificate paths with 2 root CA certificates. Very strange setup!
3. Disable the other root CA certificate in the certificate store - Run certificate console and disable "GTE CyberTrust Global Root" as shown in previous tutorials.
4. Run the .NET test program again:
C:\herong>WebReader.exe https://login.yahoo.com <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org... <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <title>Sign in to Yahoo!</title> ...
The test program still works with the second root CA certificate disabled. Why? May be .NET is not verifying server certificate. Or may be .NET is using some other ways to verify server certificate. Read the next tutorial for answers.
Last update: 2011.
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