3458328 - SUM Phase:AccessCheck FAIL: NIECONN_REFUSED (Connection timed out), NiRawConnect failed in plugin_fopen()

• The SUM fails in this step:
  CURRENTPHASE PREP_INPUT/INSTANCELIST_PRE
  ...started at 20240414105141
  # Using phase log file 'INSTANCELIST_PRE.LOG'.
  ...finished at 20240414105352 with status ABORTED.
  # Error message set: 'sapcontrol error at AccessCheck: FAIL: NIECONN_REFUSED (Connection timed out), NiRawConnect failed in plugin_fopen()'
  ...begin dialog at 20240414105353
• EXECUTING /usr/sap/<SID>/DVEBMGS00/exe/sapcontrol -host <hostname> -nr 01 -queryuser -function AccessCheck Start <User> <Password> 17.04.2024 10:51:32 AccessCheck FAIL: NIECONN_REFUSED (Connection timed out), NiRawConnect failed in plugin_fopen() SAPup> Process with PID 21380 terminated with status 1 at 20240417105132!
• Here is visible, that the command is running on 00 instance, and it is asking for the 01 instance, if AccessCheck can be started. The 01 and 02 instances are on different hosts.

• SAP NetWeaver

 AccessCheck: FAIL: NIECONN_REFUSED, Connection timed out, NiRawConnect failed in plugin_fopen()',CURRENTPHASE PREP_INPUT/INSTANCELIST_PRE , KBA , BC-UPG-TLS-TLA , Upgrade tools for ABAP , BC-CST-STS , Startup Service , Problem