driver <- JDBC("com.amazon.redshift.jdbc42.Driver", "~/Downloads/RedshiftJDBC42-1.2.1.1001.jar", identifier.quote="`")
# url <- "<JDBCURL>:<PORT>/<DBNAME>?user=<USER>&password=<PW>
url <- "jdbc:redshift://<cluster-name>.<xxxxxx>.us-east-1.redshift.amazonaws.com:5439/<dbname>?user=<username>&password=<password>"

conn <- dbConnect(driver, url)

Error in .jcall(drv@jdrv, "Ljava/sql/Connection;", "connect", as.character(url)[1],  :
  java.sql.SQLException: [Amazon](500150) Error setting/closing connection: Operation timed out.