| Event Id | 1503 |
| Source | MSExchangeOMA |
| Description | An unknown error occurred while processing the current request: Exception of type System.OutOfMemoryException was thrown. |
| Event Information | According To Microsoft:" CAUSE: This problem may occur if Exchange Server 2003 is running on a Microsoft Windows 2000-based computer. In this scenario, virtual memory fragmentation may occur if Exchange Server 2003 is under a heavy load. You may experience this problem during stress-testing of your Exchange Server environment. RESOLUTION: 1. Obtain and install the hotfix that is described in the following Microsoft Knowledge Base article: 820745 (http://support.microsoft.com/kb/820745/) Failfast occurs when you experience an "out of memory" condition 2. Configure the following registry entry with a value of 1: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\.NETFramework Value name: GCFailFastOnOOM Value type: REG_DWORD Value data: 1 After you configure this registry entry, if you experience an out-of-memory condition on your Exchange Server computer, an event that contains the following description is logged: Failed to allocate numberOfbytes bytes with numberOfbytes bytes in use and numberOfbytes free bytes. Process will be Terminated However, in this scenario, a new process is automatically started on the next user request. No administrative action is required. |
| Reference Links | Outlook Mobile Access users cannot access their mailboxes on a heavily-loaded Exchange Server 2003 computer |
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