Snort auto-starting?
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I have Snort installed on my device, and I am sure that I had it stopped. My device has been on for over 200 days, so it has not been recently rebooted. I logged in to find that Snort is running. Is there any reason it would start on its own?
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Anything that causes the pfSense built-in script "restart all packages" to execute would automatically restart Snort (since it is an installed package). The "restart all packages" script can be triggered by several events within pfSense (for instance, your WAN IP cycling to a new value or the link going down and then back up).
If you truly do not want Snort to ever start on an interface, go to the INTERFACE SETTINGS tab for that instance and uncheck the Enable checkbox. That will disable Snort on that interface.