Intermittent error in Plesk: "An operation on a socket could not be performed because the system lacked sufficient buffer space"

Created:

2016-11-16 13:15:33 UTC

Modified:

2017-08-08 13:23:22 UTC

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Intermittent error in Plesk: "An operation on a socket could not be performed because the system lacked sufficient buffer space"

Applicable to:

  • Plesk for Windows
  • Plesk 12.0 for Linux

Symptoms

Operations in the control panel fail intermittently with this error:

ERROR: PleskMainDBException
An operation on a socket could not be performed because the system lacked sufficient buffer space or because a queue was full.

Cause

The server is trying to establish an outbound TCP connection from a port with a number greater than 5,000. Usually, this behavior is triggered by the existence of too many open outbound network connections on the server.

Resolution

Reconfigure the server to increase the maximum number of TCP ports from which outbound connections can be established. Instructions can be found in the Microsoft Knowledgebase article KB196271 .

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