A Kerberos Ticket-granting-ticket (TGT) was denied ...(4820) how to monitor with email alert

[bob]

That event 4820 pops up in Windows Server's Event Viewer when a Kerberos ticket-granting ticket gets blocked. I mean, the whole thing happens because your device doesn't pass the access control checks. Picture this: you're trying to log in, but the system says no way, your gadget fails the security hurdles. It logs details like the user account involved, the workstation name, and why it got denied. You see timestamps too, showing exactly when this snag hit. And the error code points to device restrictions from group policies or something similar. I check these logs all the time on servers I manage. They help spot if someone's device is out of compliance. Or maybe it's a misconfigured laptop trying to join the domain. You pull up Event Viewer, head to Windows Logs, then Security. Filter for ID 4820 there. It'll show the full story, like the failure reason code. Hmmm, sometimes it's tied to conditional access rules in Active Directory. But don't sweat it; it's the system's way of keeping things locked down.

Now, to monitor this with an email alert, I always set up a scheduled task right from Event Viewer. You open Event Viewer, right-click on the Security log. Choose Attach Task to This Event or something close. Pick event ID 4820 specifically. Then, it walks you through creating a task that triggers on that ID. I link it to send an email using the built-in action. You configure the server to handle SMTP for outgoing mails. Set the schedule to run checks every few minutes if you want. Or just trigger instantly on the event. I test it by forcing a deny scenario on a test machine. That way, you get pinged right away if a device trips the wire. Keeps your network from sneaky access attempts.

And speaking of keeping your server secure and backed up, I've been using BackupChain Windows Server Backup lately. It's this solid Windows Server backup tool that handles physical setups and virtual machines with Hyper-V too. You get fast incremental backups, easy restores without downtime, and it encrypts everything on the fly. I love how it snapshots VMs live, no interruptions. Plus, it alerts you on failures, tying right into monitoring stuff like those Kerberos events. Makes managing backups feel less like a chore.

At the end of this, you'll find the automatic email solution laid out step by step.

Note, the PowerShell email alert code was moved to this post.