AWS Postgres: 'The remote certificate is invalid'

dustout, this doesn't work for me. I get stuck in an endless loop. This is what happens for me:

I select "Get Data", then "Database, then "PostgreSQL database" and click Connect.

It prompts me for the Server and Database. I enter the RDS endpoint and database name and click OK.

I get the "Unable to connect" error (interestinly, it has not even asked for the usernamer and password)

I click "Cancel"

I go to "File", "Options and settings", "Data source settings".

With the "Global permiussions" radio button selected, I see my RDS endpoint listed.

I click on the RDS endpoint and click "Edit permissions"

The "Encrypt connections" checkbox is checked.

I un-check the checkbox and click "OK", then "Close".

Once more, I select "Get Data", then "Database, then "PostgreSQL database" and click Connect.

Once more, it prompts me for the Server and Database. I enter the RDS endpoint and database name and click OK.

This time I get a different error message. I get "We couldn't authenticate with the credentials provided. Please try again"

I enter the username and password and click "Connect"

Once again, I get the first "Unable to connect" error message dialog again!

I click "Cancel".

I go back to "File", "Options and settings", "Data source settings".

The "Encrypt connections" checkbox has become checked again by itself, without me changing it.

Any ideas on how solve this?