I have the same question that was asked here Connect to Redshift via SSL using R
However, the answer given requires certificate validation. I\'m wondering if there i
Instead of passing verify-full to sslmode, try require or allow:
verify-full
sslmode
require
allow
dbConnect(dbDriver('PostgreSQL'), dbname = 'dbname=foobar sslmode=require', host = 'foobar.redshift.amazonaws.com', port = 5439, user = 'foobar', password = 'foobar')