Can you connect to node1 using psql with and without SSL?
Where is node1 relative to the machine you are running pg_basebackup from?
Just to be clear both Postgres instances are running 10.5, correct?
Every instances are same (10.5) version, and every servers are in the common VMWARE subnet. The psql connection is working fine with sslmode or without sslmode.
When I try run it on the localhost (node1), I've same errors too: