How to fix “The Kerberos protocol encountered an error while validating the KDC certificate during smartcard logon. There is more information in the system event log. [ERROR_PKINIT_FAILURE (0x4EF)]” – Error Code 1263

Overview

In this article, we’ll focus on resolving the issue described as: “The Kerberos protocol encountered an error while validating the KDC certificate during smartcard logon. There is more information in the system event log. [ERROR_PKINIT_FAILURE (0x4EF)]”. This error, identified by the error code Error Code 1263, can impede your system’s performance, and here’s how you can fix it.

Identifying the Problem

Error Code 1263 is a prevalent issue that occurs when the Kerberos protocol experiences a problem during smartcard logon. It’s primarily caused by the validation failure of the Key Distribution Center (KDC) certificate. This error might be accompanied by the following symptoms:

• Inability to log in using a smartcard
• System event log displaying the error message
• Network connectivity issues

Common Fixes

1. Renew the KDC Certificate:

• Log in to the domain controller as an administrator.
• Open the command prompt as an administrator.
• Run the following command: ksetup /certutil:certrenew
• Restart the KDC service: net stop kdc && net start kdc

2. Enable Smartcard Logon:

• Open Local Security Policy (secpol.msc).
• Navigate to Security Settings > Local Policies > Security Options.
• Enable the policy: “Interactive logon: Require smart card”

3. Check Firewall Settings:

• Ensure that ports 88, 123, 389, 443, 464, 636, and 3268 are open in your firewall configurations.
• Allow the Kerberos protocol and related services to communicate through the firewall.

Advanced Troubleshooting

1. Check Domain Controller Time Synchronization:

• Verify that all domain controllers have synchronized time with a reliable time source.
• Use the following command to check time synchronization: w32tm /stripchart

2. Reset Computer Account Password:

• Join the computer to the domain and restart it.
• Log in as the local administrator.
• Open the command prompt as an administrator.
• Run the following command: netdom resetpwd /s:domain.name /ud:domainuser /pd:*

3. Update Network Drivers:

• Check for updates for your network adapter drivers.
• Install the latest drivers provided by the manufacturer.

Conclusion

By applying the fixes outlined in this article, you should be able to resolve Error Code 1263 and restore the smooth functioning of your system. Remember to keep your system up to date with the latest security patches and adhere to best practices for network configuration to prevent this error from recurring.