popen timeout received, but no child process

[Nair]

Hi Friends,

Any clue on below meesage:

------------------------------------
Node         : host.domain.com
Node type    : External Node
Severity     : critical
Message      : host.domain.com popen timeout received, but no child process
Msg Group    : Messaging
Application  : nagios
Object       : nagios
Instruction  : No

Customer not found in ESL
------------------------------------

Thank you,
Nair

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