Agent Unable to Communicate with OMS EM12c

My phone started going crazy with alerts from EM12c, apparently all of my agents had lost communication with OMS.  I immediately started checking all of the logs on OMS, not finding anything of interest I decided to try an upload from one of the host:

./emctl upload agent

WARN – Ping communication error
o.s.emSDK.agent.comm.exception.ConnectException [Failure connecting to https://HOST.domain.com:4889/empbs/upload , err host.domain.com]

./emctl pingOMS

Can’t find host host.domain.com

Interesting, but makes sense after all the only agent able to communicate to the OMS actually resides on the same host.

ping host.domain.com

Same results

After an email exchange with the Linux administration some changes had occurred in DNS that needed to be reverted.  Once that had been completed the ping worked and all agents showed as up.

 

 

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