Exchange 2010 Error 452 4.3.1
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Exchange 2007 transport presentation tomorrow morning at TechMentor. When trying to telnet to the SMTP port of an Exchange 2007 Hub Transport server, I got the following error: 452 4.3.1 Insufficient system resources Not a good thing the night before a presentation - Murphy's law at work again! The Application Event Log has Event ID 15002 from MSExchangeTransport saying "The resource pressure is constant at High. Statistics… ". The event goes on to tell you that inbound mail submission http://www.norman.com/no/business/support/support_articles/not_receiving_email-4.3.1_insufficient_system_resources has stopped, and it's due to disk space being low on the volume where the queue database is located. Figure 1: Event ID 15002 logged by MSExchangeTransport Exchange Server 2007 transport queues are not the familiar .eml files you see in Exchange Server 2003/2000, which reside in the \mailroot\vsi \queue folder ( is the instance number http://exchangepedia.com/2007/03/exchange-server-2007-transport-452-4-3-1-insufficient-system-resources.html of the SMTP virtual server) on the file system. Yes, transport queues have been moved to a JET database of its own. What's Back Pressure? In Exchange Server 2007 and later, the Transport service monitors system resources such as disk space and memory on Transport servers (the Hub Transport and the Edge Transport servers), and stops message submission if it's running low on these resources. It continues to deliver existing messages in the queue. When resource utilization returns to normal, it resumes message submission. The feature is called Back Pressure (Back Pressure documentation for previous versions: Exchange 2010 | Exchange 2007 - these docs are accessible from the Other Versions drop-down from any of these links"). In this case, Exchange required 4 Gigs of free disk space on the volume where the Queue database was located - I had about 3.95 Gigs. :) Changes to Back Pressure settings in Exchange Server 2007 SP1 The Back Pressure settings in Exchange Server 2007 RTM stop inbound mailflow if fre
4.3.1 Insufficient system resources Private bytes under pressure » Jan 25 How to fix error: 452 4.3.1 https://kx.cloudingenium.com/microsoft/servers/exchange/exchange-2010/how-to-fix-error-452-4-3-1-insufficient-system-resources-on-exchange-server-2007-or-2010/ Insufficient system resources on Exchange Server 2007 or 2010 Categories: Exchange 2010 by Juan Carlos A Guide to Back Pressure in Microsoft Exchange Server For most Exchange administrators the first time they encounter the concept of “back pressure” is when they see this error:
452 4.3.1 Insufficient system resources exchange 2010 The resource pressure increased from Medium to High. The following resources are under pressure: Private bytes = 76% [High] [Normal=71% Medium=73% High=75%] The following components are disabled due to back pressure: Inbound mail submission from Hub Transport servers Inbound mail submission from the Internet Mail submission from Pickup directory Mail exchange 2010 error submission from Replay directory Mail submission from Mailbox server Loading of e-mail from the queuing database (if available) The following resources are in normal state: Queue database path ("C:Program FilesMicrosoftExchange ServerV14TransportRolesdataQueuemail.que") = 15% [Normal] [Normal=95% Medium=97% High=99%] Queue database logging path ("C:Program FilesMicrosoftExchange ServerV14TransportRolesdataQueue") = 15% [Normal] [Normal=94% Medium=96% High=98%] Version buckets = 0 [Normal] [Normal=80 Medium=120 High=200] Physical memory load = 60% [limit is 94% to start dehydrating messages.] Batch Point = 0 [Normal] [Normal=2000 Medium=4000 High=8000] Submission Queue = 0 [Normal] [Normal=1000 Medium=2000 High=4000] This error is generally noticed because external servers are unable to deliver email and error messages begin appearing on the event log as the one shown above. You will notice the first error on a connection attempt via SMTP. What is back pressure? The Microsoft Exchange Transport Service Resource Monitoring When an Edge or Hub Transport server is found in an overloaded state and is active