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ITsVISTA KB-Link: KB2020447

Socket communication using the loopback address will intermittently encounter a five second delay

On a multi-processor computer that is running on a Windows version listed in the Applies To section, recv() sometimes waits five seconds using the loopback address (


  • Repeated large transfer data more than 64KB to 1MB.
  • Using Loopback address (
  • Multi-processor computer.

For more information on this issue, including potential causes, workarounds, and resolutions, see: Microsoft KB Article KB2020447.

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