Fix STATUS_KDC_INVALID_REQUEST (0xC00002FB) Error

Cause #1: Clock Skew — Time Sync Problem

The most common reason for this error is a big time difference between your computer and the domain controller. Windows Kerberos requires the time to be within 5 minutes of the DC. If it's off by more, you get this error.

This often happens after a daylight saving change, or when the BIOS battery is dying. I've seen it on laptops that were asleep for weeks.

Fix: Sync time with the domain controller

1. Open Command Prompt as Administrator. Click Start, type cmd, right-click Command Prompt, choose Run as administrator.
2. Type this command and press Enter:

   w32tm /resync

   After running it, you should see a message like "The command completed successfully." If you get an error, continue to the next step.
3. Check your current time source:

   w32tm /query /source

   It should show your domain controller hostname, like dc01.yourdomain.com. If it shows Local CMOS Clock, that's the problem.
4. Force sync with the DC manually:

   w32tm /config /manualpeerlist:yourdc.yourdomain.com /syncfromflags:manual /reliable:yes /update
   net stop w32time && net start w32time
   w32tm /resync

   Replace yourdc.yourdomain.com with your actual DC name. After the last command, you should see "The command completed successfully."

If the time was way off, you might need to reboot the computer. After reboot, test by trying to log in again or run gpupdate /force. The error should be gone.

Cause #2: DNS Misconfiguration

The second most common cause is DNS. If your computer can't find the domain controller, the KDC can't process your request. This error shows up when DNS points to the wrong server or there's no reverse lookup zone.

You'll see this often after changing the network, like moving from office to home VPN. The computer still has the old DNS server cached.

Fix: Check and fix DNS settings

1. Open Command Prompt as Administrator.
2. Check what DNS servers you're using:

   ipconfig /all | findstr "DNS Servers"

   You should see the IP of your domain controller here. Not 8.8.8.8 or your router's IP.
3. Flush the DNS cache:

   ipconfig /flushdns

   It should say "Successfully flushed the DNS Resolver Cache."
4. Test that you can find the DC:

   nslookup yourdomain.com

   Replace yourdomain.com with your actual domain name (like contoso.com). You should get the DC's IP address back. If you get "can't find" or a timeout, DNS is broken.
5. Fix it by setting the correct DNS server in network settings:
   • Open Control Panel > Network and Sharing Center > Change adapter settings.
   • Right-click your active network adapter (usually Ethernet or Wi-Fi), choose Properties.
   • Select Internet Protocol Version 4 (TCP/IPv4), click Properties.
   • Choose "Use the following DNS server addresses" and enter your DC's IP. For example: 192.168.1.10. Click OK.

After changing DNS, run ipconfig /flushdns again and then test with gpupdate /force. The error should clear up.

Cause #3: Corrupted Kerberos Ticket Cache

Sometimes the Kerberos tickets on your machine get corrupted. This can happen after a network blip or when the computer was forced to shutdown. The KDC sees the request as invalid because the ticket doesn't match what it expects.

Fix: Clear the Kerberos ticket cache

1. Open Command Prompt as Administrator.
2. List current Kerberos tickets:

   klist

   You'll see a list of tickets with service names like krbtgt/YOURDOMAIN.COM. If it's corrupted, you might see errors here.
3. Purge all tickets:

   klist purge

   It should say "Current LogonId is 0:0x... Deleting all tickets."
4. After purge, lock your computer (Windows+L) and log back in. This gets a fresh ticket from the DC.
5. Verify new tickets are created:

   klist

   You should see at least one ticket for krbtgt/YOURDOMAIN.COM.

If the error still appears after this, you might need to reboot the machine and log in again. I've seen cases where a simple logoff doesn't clear the problem — a full restart does.

Quick-Reference Summary Table

Start with the clock sync. It fixes 8 out of 10 cases. Then check DNS. Only mess with tickets if those two don't work. Good luck.