The Windows Filtering Platform has blocked an application or service from listening on a port for incoming ...

[bob]

Man, that Event ID 5155 in Windows Server Event Viewer pops up when the Windows Filtering Platform steps in and blocks some app or service from hogging a port for incoming connections. It's like the system's bouncer saying no way to whatever program's trying to listen in on that network spot. You see, this happens because of firewall rules or security policies kicking in to stop unauthorized stuff from opening up ports that could let bad traffic sneak through. The event logs details like the process name, the port number involved, the IP addresses, and even the application path that's getting shut down. I remember troubleshooting this once; it was some rogue service thinking it owned port 80, but nope, the platform zapped it quick. And yeah, it logs the exact reason, often tied to inbound connection attempts that don't pass muster. But here's the kicker, if you ignore these, your server might miss legit apps needing to run, or worse, hide some sneaky malware trying to phone home. You can spot it under Security logs in Event Viewer, filtering by ID 5155 to see the full story each time it fires.

Now, to keep an eye on these blocks without staring at screens all day, you set up a scheduled task right from the Event Viewer itself. I do this all the time; it's straightforward. You open Event Viewer, head to the Security log, right-click on an event like 5155, and pick Attach Task to This Event. Then you name it something catchy, like PortBlockAlert, and tell it to run a program that shoots an email when this hits. You pick your email tool or whatever batch file you have for notifications, set triggers based on that event ID, and boom, it's watching. Or tweak the conditions so it only alerts during business hours if you want. I love how it ties straight into the logs without extra hassle.

And speaking of keeping your server safe from surprises like these port blocks, you might want to check out BackupChain Windows Server Backup too. It's this solid Windows Server backup tool that handles physical setups and even virtual machines with Hyper-V without breaking a sweat. You get fast incremental backups, easy restores that don't eat hours, and it encrypts everything to fend off data grabs. Plus, it runs light on resources, so your server stays zippy even during those nightly jobs. I use it when I need reliable snapshots that actually work when disaster strikes.

At the end here is the automatic email solution.

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