Note: This article was originally published in 2013. Some steps, commands, or software versions may have changed. Check the current Exchange documentation for the latest information.

In this step-by-step guide, you’ll learn fix error: 452 4.3.1 insufficient system resources private bytes under pressure. Microsoft Exchange Server is a mail server and calendaring server developed by Microsoft, used for enterprise email, calendar, contacts, and task management.

Prerequisites

Before you begin, make sure you have:

  • Exchange Server installed and configured
  • Administrative access to Exchange Management Console/Shell
  • Active Directory environment

How to fix error: 452 4.3.1 Insufficient system resources Private bytes under pressure

Many people encounter (http://technology.bauzas.com/microsoft/servers/exchange/exchange-2010/how-to-fix-error-452-4-3-1-insufficient-system-resources-on-exchange-server-2007-or-2010/ “How to fix error: 452 4.3.1 Insufficient system resources on Exchange Server 2007 or 2010”)now and then, but when you have a recently new machine freshly installed and your email traffic is not that intense… How can you keep getting Private Bytes errors!? Well, the answer is simple in many cases: (http://en.wikipedia.org/wiki/Dynamic_memory_allocation “Dynamic memory allocation”) As you probably know, Dynamic memory is not supported or recommended by (<http://maps.google.com/maps?ll=47.6395972222,-122.12845&spn=0.01,0.01&q=47.6395972222,-122.12845 (Microsoft)&t=h> “Microsoft”) to be used on any (http://www.microsoft.com/exchange “Microsoft Exchange Server”). What gives? Who doesn’t love Dynamic Memory? Well, Exchange was not designed with Dynamic memory in mind, but rather, it was designed to use all available memory it could get it’s hands on to improve performance.

So how come Dynamic memory is messing up with my Exchange this time?

I am not expert but the reason seems to be your initial memory allocated to your (http://en.wikipedia.org/wiki/VM_%28operating_system%29 “VM (operating system)”). Most likely Exchange considering it has a fixed amount of memory will initialize its counters and thresholds using a constant amount of memory. Given that scenario, it is no wonder that if you start your VM with 512 mb you can eat up your private memory quite fast even if your physical server has gigs and gigs of (http://en.wikipedia.org/wiki/Random-access_memory “Random-access memory”). The issue went away when I started using normal (static) allocation of memory rather than dynamic. I also went as far as to play with my previous hypothesis and it worked. I assigned a “high” amount of dynamic memory to start the system with and then dynamic memory takes some of it away if it is IDLE. This has worked fine with me but I would recommend following Microsoft’s recommendations and using static memory. I kind of like living on the “edge” lol. Hope this helps!

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Summary

You’ve successfully learned fix error: 452 4.3.1 insufficient system resources private bytes under pressure. If you run into any issues, double-check the prerequisites and ensure your Exchange environment is properly configured.