Agent fails with "U02004254 Connection Object 'CONN.OBJECT' is not a valid 'ABAP' connection, entry 'rfcHostname' is missing."

Document ID : KB000113323
Last Modified Date : 11/09/2018
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Issue:
The start of an SAP-agent fails with the error message:
 
U02004254 Connection Object 'CONN.ERE_1_NEU' is not a valid 'ABAP' connection, entry 'rfcHostname' is missing.

The internal parameter rfcHostname refers to the parameter Application Server in the Connection Object when Custom Application Server is used for RFC Connection Type.
 
User-added image

In this case, Group/Server Selection was used as RFC Connection Type.
 
User-added image

I.e. Application Server was not used and still, the error message says the parameter is missing.
Cause:
The root cause is still under investigation by development.
Resolution:
The root cause is still under investigation by development. Install the fixed versions as soon as they are available.