Connecting to redshift cluster

Hi, I have created a new redshift cluster. I am trying to connect to the cluster in looker. I have created a vpc security group with the 5 looker ips whitelisted as inbound rules. 

I am getting this error. Any suggestions on how to debug this issue? Thanks!

Cannot connect: Cannot create PoolableConnectionFactory (The connection attempt failed.)

JDBC string: jdbc:postgresql://redshift.xxxxxx.com/dev?tcpKeepAlive=true&socketTimeout=28800&ssl=true&sslfactory=org.postgresql.ssl.NonValidatingFactory&sslmode=prefer

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