In the ini file for the Unix Agent the bindaddr parameter has been defined to use a particular address, which is different from the physical address, but the agent still uses the physical address of the server to connect to the Automation Engine.
This issue has been corrected and is currently planned for release in the following versions:
Automation Engine 12.1.4 - available.
Automation Engine 12.2.2 - planned for the end of February 2019.
Automation Engine 12.3.0 - planned for the end of June 2019.
Please download and install one of the above mentioned or higher versions to obtain the correction.