SSL Error When Connecting to LP360 Online License

Problem

If you encounter the following error while attempting to connect to LP360 Online using the LP360 License Manager:

Error Message:
"Cannot contact auth service; cause is 'SSL Error: WINHTTP_CALLBACK_STATUS_FLAG_CERT_REV_FAILED failed to check revocation status.'" 

This error indicates that the system is unable to verify the revocation status of the SSL certificate used by the LP360 Online authentication service.

Possible Causes

• Internet Connectivity Issues: The system may not have internet access or is behind a restrictive network.
• Firewall or Proxy Blocking: Security software or network configurations may be blocking access to certificate revocation servers.
• Incorrect System Time: An inaccurate system clock can cause SSL validation failures.

Probable Resolutions

✅ 1. Check Internet Access

Ensure the system has unrestricted access to the internet, especially to certificate validation services.

✅ 2. Review Firewall/Proxy Settings

Verify that your firewall, antivirus, or proxy settings are not blocking access to LP360 Online services. Refer to the LP360 Online section of the Antivirus Exceptions article for specific domains and executables that should be whitelisted.

✅ 3. Verify System Time

Check that your system clock and time zone are set correctly using time.gov. An incorrect time can interfere with SSL certificate validation.