SIDs were filtered (4675) how to monitor with email alert

[bob]

You ever notice how Windows Server keeps tabs on who gets what permissions when they log in? Event 4675 pops up right there in the Event Viewer, under security logs mostly. It flags when certain SIDs, those unique IDs for users or groups, get filtered out during a logon process. Basically, the system says hey, this account tried to bring in some privileges, but we blocked a bunch because they don't match the allowed stuff on this machine. I mean, it's all about keeping things tight, like if someone's logging in remotely or locally, and the server decides some of those identity bits just won't fly due to policy rules. You see it triggered by things like group policy filters or explicit denies in the security setup. And it logs the exact SIDs that got nixed, plus the account name and the time stamp, so you can trace back if something fishy happened. But sometimes it fires off too much, like during normal admin work, and you gotta sift through to spot real issues. I check mine weekly just to stay ahead.

Want to keep an eye on these without staring at screens all day? Fire up Event Viewer on your server. You right-click the security log, pick filter current log, and punch in 4675 as the event ID. That narrows it down quick. Now, to get alerts, you attach a task to it. I do this by selecting create custom view first, add that event ID filter, then right-click the view and hit attach task to this custom view. You name the task something catchy, like SID Filter Alert, and set it to run a program when the event hits. For email, point it to your mail client or a simple batch that shoots off a note, but we'll skip the gritty code part. Make sure the task triggers on any user logon or whatever fits your setup. I test it by forcing a logon that should trip it, just to watch the email ping my inbox. Keeps you looped in without the hassle.

And speaking of staying on top of server quirks like these security events, you might wanna think about solid backups to roll back if something goes sideways from a filtered SID mess-up. That's where BackupChain Windows Server Backup comes in handy for me. It's this straightforward Windows Server backup tool that handles full system images and also tackles virtual machines on Hyper-V without breaking a sweat. You get fast incremental backups, easy restores even to dissimilar hardware, and it cuts down on downtime big time, plus encryption keeps your data locked tight. I rely on it to mirror those event logs too, so nothing gets lost in the shuffle.

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