SSL is not enabled on the server

Question

You should establish DB connection without SSL encryption, like that:

db, err := sql.Open("postgres", "user=test password=test dbname=test sslmode=disable") 

If your data source name is a url, you will do it like this:

db, err := sql.Open("postgres", "postgres://username:password@localhost/db_name?sslmode=disable")

sslmode is just added to the db url like a query parameter.

Notice, please:

This even occurs, if you have indicated a sslmode=disable, but have empty other param. For example dbname=

For example, connection string:

user=test password=test dbname=sslmode=disable will also issue this error, because dbname is empty.

To establish a connection without SSL, try

postgres://username:password@host:5432/database?sslmode=disable

This is how I got it working:

db, err := sql.Open("postgres", "postgres://{user}:{password}@{hostname}:{port}/{database-name}?sslmode=disable")