[FATAL] [INS-10111] Installer encountered errors while copying to nodes

Those days, I tried to deploy a new Oracle Database 19c (19.15) in an Oracle Linux 7.9. This was a Real Application Clusters (RAC) Database Home, the GI was on version 19.14, and the problem was weird:

[oracle@au1 dbhome_2]$ ./runInstaller -applyRU /u01/app/oracle/product/19/33515361 -responseFile /tmp/db_2022-04-28_07-28-17PM.rsp -silent -ignorePrereqFailure
Preparing the home to patch...
Applying the patch /u01/app/oracle/product/19/33515361...
Successfully applied the patch.
The log can be found at: /u01/app/oraInventory/logs/InstallActions2022-04-28_09-13-26PM/installerPatchActions_2022-04-28_09-13-26PM.log
Launching Oracle Database Setup Wizard...

[WARNING] [INS-13013] Target environment does not meet some mandatory requirements.
   CAUSE: Some of the mandatory prerequisites are not met. See logs for details. /u01/app/oraInventory/logs/InstallActions2022-04-28_09-13-26PM/installActions2022-04-28_09-13-26PM.log
   ACTION: Identify the list of failed prerequisite checks from the log: /u01/app/oraInventory/logs/InstallActions2022-04-28_09-13-26PM/installActions2022-04-28_09-13-26PM.log. Then either from the log file or from installation manual find the appropriate configuration to meet the prerequisites and fix it manually.
The response file for this session can be found at:
 /u01/app/oracle/product/19/dbhome_2/install/response/db_2022-04-28_09-13-26PM.rsp

You can find the log of this install session at:
 /u01/app/oraInventory/logs/InstallActions2022-04-28_09-13-26PM/installActions2022-04-28_09-13-26PM.log
[FATAL] [INS-10111] Installer encountered errors while copying /u01/app/oracle/product/19/dbhome_2 to nodes [au2].
   ACTION: Review the log file /u01/app/oraInventory/logs/InstallActions2022-04-28_09-13-26PM/installActions2022-04-28_09-13-26PM.log for further details on failure.
   SUMMARY:
       - PRCF-2010 : All connections to the remote nodes got refused. Cannot proceed with the file transfer. There has to be at least one remote node to send the installer files!
[FATAL] [INS-10111] Installer encountered errors while copying /u01/app/oracle/product/19/dbhome_2 to nodes [au2].
   ACTION: Review the log file /u01/app/oraInventory/logs/InstallActions2022-04-28_09-13-26PM/installActions2022-04-28_09-13-26PM.log for further details on failure.
   SUMMARY:
       - PRCF-2010 : All connections to the remote nodes got refused. Cannot proceed with the file transfer. There has to be at least one remote node to send the installer files!
[oracle@au1 dbhome_2]$

The SSH connection was working. The firewall was disabled, so after a lot of research, I found out this was related to some bug. The problem is that all the solutions offered by those bugs haven't solved my issue.

Finally, I end up installing single-mode Oracle Database Homes on all my nodes and later converted them to RAC mode, as I show in this blog post: https://www.dbarj.com.br/en/2022/04/how-to-convert-non-rac-oracle-home-to-rac-oracle-home/.

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