Article ID: 8185, created on Mar 12, 2010, last review on May 7, 2014

  • Applies to:
  • Plesk for Windows


A large server (large disk space of physical hosting domains) with Windows 32-bit and Parallels Plesk Panel cannot be backed up. The following error appears in the backup task results:

Unable to close zip archive
Exception of type 'System.OutOfMemoryException' was thrown.
Exception of type 'System.OutOfMemoryException' was thrown.


All 32-bit applications have a 4-gigabyte (GB) process address space (32-bit addresses can map a maximum of 4 GB of memory). Microsoft Windows operating systems provide applications with access to 2 GB of process address space, specifically known as user mode virtual address space.

When trying to create large ZIP archive, 2 GB process address space is exhausted, which causes System.OutOfMemoryException.


  1. It is necessary to increase the accessible process address space by up to 3 GB using the "/3gb" parameter in the Windows system boot.ini file. The procedure is described in the Microsoft Technet article at

  2. In the Windows registry, the SystemPages parameter of the HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\Memory Management key should be set to 0.

    NOTE: After making these changes, the server must be rebooted.

  3. As described in, the /3GB and /userva parameters are valid only on boot entries for 32-bit versions of Windows on computers with x86 or x64-based processors.

    To take advantage of the 3 GB available to user-mode programs, the program must be linked with the /LARGEADDRESSAWARE option. To modify already compiled binaries, use editbin.exe utility from Visual Studio set of build tools:

    editbin.exe /LARGEADDRESSAWARE "%plesk_bin%\backup.exe"

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