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EM 12: Agent Crash / Restart with Message 'No buffer space available (maximum connections reached)' Reported in gcagent.log (Doc ID 1949321.1)

Last updated on NOVEMBER 17, 2019

Applies to:

Enterprise Manager Base Platform - Version and later
Generic Windows


<AGENT_BASE_DIR>\core\\bin\emctl start agent

fails with following error

Oracle Enterprise Manager Cloud Control 12c Release 4
Copyright (c) 1996, 2014 Oracle Corporation.  All rights reserved.
The Oracleagent12c1Agent service is starting................
The Oracleagent12c1Agent service could not be started.


EM 12c Agent restarts / crashes with following message  No buffer space available (maximum connections reached)

<AGENT_INST_HOME>/sysman/log/gcagent.log reports the following exception

2014-10-05 04:44:16,104 [132:8AA4267B] WARN - Ping communication error
o.s.emSDK.agent.comm.exception.ConnectException [Failure connecting to , err No buffer space available (maximum connections reached?): connect] [No buffer space available (maximum connections reached?): connect]
2014-10-05 04:44:36,212 [52:C09F1B94] INFO - attempting another heartbeat


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In this Document
  Solution for Windows
 Solution for Unix

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