Redshift connection error port 16455 ?

Help
1

I am getting an error when connection to Redshift about port 16455? Not sure what that port is needed for?

I was able to connect dbt Cloud through SSH to Redshift yesterday and execute queries.
But, today, I am getting the following error:

Opening a new connection, currently in state init
Redshift adapter: Connecting to Redshift using 'database' credentials
Postgres adapter: Got a retryable error when attempting to open a redshift connection.
Postgres adapter: Error running SQL: with
Postgres adapter: Rolling back transaction.
Timing info for rpc.warehouse.request (execute): 2023-03-16 15:53:01.286054 => 2023-03-16 15:53:01.287892
On rpc.warehouse.request: No close available on handle
Got an exception: Database Error
  could not connect to server: Connection refused
  	Is the server running on host "127.0.0.1" and accepting
  	TCP/IP connections on port 16455?

Not sure why dbt is trying to connect to port 16455?

2

Restarting the dbt Browser IDE fixed the issue. But curious to know what this port is for or why I was seeing this error?