Cannot view jobs reports for running jobs on Unix Agent - invalid Msg from Agent error

Document ID : KB000121406
Last Modified Date : 16/01/2019
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When attempting to view the report of a running job on a v12.1.3 or v12.2.1 Unix Agent, the following error is thrown:
Received Error message 'U00003399 The Server 'UC4#CP003' rejected an invalid message.'

The CP log has the following message:
U00009907 Memory dump 'Invalid Msg from Agent <AgentName>' (Address='0x18a3b90', Length='775') 
This is a bug in the Unix Agent. 
This issue is a bug which is fixed in the following versions:
  • Automation Engine 12.1.4 - Available
  • Automation Engine 12.2.2 - Available
  • Automation Engine 12.3.0 - Planned release 2019-06-28
  • Automation Engine 12.0.9 - Planned release 2019-09-09

Downgrade the Unix Agent to 12.1.2/12.2.0