[INS-06006] Passwordless SSH connectivity not set up between the following node(s) when adding a new RAC node in 19c

Problem:

When trying to add an extra node to a 19c cluster by running $GRID_HOME/gridSetup.sh from an active node in the cluster, I was keep getting INS-06006 error, although the passwordless configuration already working fine between the current cluster nodes and the new node:

 

 

 

 

Analysis:

After hours of searching and trying lots of solutions, I figured out that the following variable value was triggering that bug:

 

Solution:

Set parameter SSH_AUTH_SOCK to zero:

# echo "export SSH_AUTH_SOCK=0" >> ~/.bashrc

# export SSH_AUTH_SOCK=0

 

Bingo! I managed to skip that bug: