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VMware on AWS - How to restore NSX DFW firewall rules to previous state

Customers who uses NSX day-in, day-out would like to have a point-in time restore functionality of DFW firewall rules. Many customer have a large footprints in VMC and make changes to DFW quite often. This feature was missing for long time and we could see its included in recent versions . Let's see how DFW configuration roll back works  NSX DFW configuration has versioning, and it is stored in the NSX Manager.  Every time when someone update DFW configuration, NSX creates one more version but keep storing the previous ones. You can rollback for previous config but reapplying it once again.  You can find the options under Networking & Security tab , > Security > Distributed Firewall . In the right side we see an Actions drop down. Choose View to get to the below screen.  Let’s go through the use case:  1. Original state- default config with no custom rules:  a. There are no saved configurations during last 30 days: In my existing test setup, with the current setting


tkrnlpa.exe is a process that runs on Windows NT, Windows XP, and the AT&T Assistant. It runs the kernel and other essential components of these operating systems. A kernel is a section of a partition that maintains an operating system’s most basic functions. By running the kernel and similar components, Ntkrnlpa.exe can run many programming-based tools that the user is not even aware of. Because of this, Ntkrnlpa.exe is a critical system process and should not be removed. The file itself can be found in the primary hard drive’s System32 and Windows folders.

How Ntkrnlpa.exe Works

Ntkrnlpa.exe runs kernel-based system services in order to perform a variety of background tasks. It contains several individual programs that work together to support the kernel of the Windows NT and XP operating systems. Ntkrnlpa.exe includes the Memory Manager, the Scheduler, the Security Reference Monitor, the Cache Manager, the Executive, and the Kernel itself. By running all of these different services simultaneously, Ntkrnlpa.exe is able to manage all other processes and system services.

Is Ntkrnlpa.exe Harmful?

Ntkrnlpa.exe is not considered a harmful program, but malicious software can impersonate it. Users can ensure that this is not the case by running an anti-virus software, such as Spyware Terminator, Malwarebytes’ Antimalware, or Advanced SystemCare. If malicious software is found on the computer, the user should also run a registry cleaner, such as CCleaner, to be sure that no damage has been done to the Windows Registry. The user may consider running these programs in Safe Mode to ensure that the malicious software is incapable of running while it is being removed. However, the user must be very careful to never remove the real Ntkrnlpa.exe file, as this could cause serious problems for the operating system.

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