Agents take a long time to connect after upgrade to V12

Products

• CA Automic Workload Automation - Automation Engine

Issue/Introduction

After upgrading to V12, the amount of time for Agents to connect after a system shutdown drastically increases, and can increase as a function of the number of Agents starting.

In the CP logs, you may see the following:

20201205/194839.396 - U00003413 Socket call 'connect(12.34.56.78, 8872)' returned error code '0'.
20201205/194839.396 -          The operation completed successfully.

The Agent log for this would appear to have something similar to:

20201205/194839.396 - U02000012 Connection to Server 'AUTOMIC#CP001' denied.
20201205/194839.396 - U02000010 Connection to Server 'AUTOMIC:2217' terminated.

Environment

Release : 12.3

Component : AUTOMATION ENGINE

Cause

This is due to the Automic Automation Engine attempting to complete a service manager scan - the ports listed above would match service manager ports (default 8871). If the Automation Engine is unable to complete the scan, it will wait for a timeout which can slow down Agent onboarding.

This scan is controlled by the setting SMGR_AUTO_SCAN

Resolution

To disable this functionality, set SMGR_AUTO_SCAN to N in UC_SYSTEM_SETTINGS within client 0.