Connecting to AWS RDS succeeds via terminal but fails in pgAdmin 4. Why?

I can establish an SSH tunnel using ssh -L 2222::5432 ec2-user@ -i ~/.ssh/key.pem and then connect to my RDS using psql "host=localhost port=2222 user=postgres password= These same settings in pgAdmin 4 do not seem to work. - Host name in connection tab = `` - Tunnel host = `` - Port in connection tab = 5432 - Port in SSH tunnel tab = 2222 - Username in connection tab = postgres - Username in ssh tunnel tab = ec2-user - Password in connection tab = `` - And identity file in ssh tunnel tab = ~/.ssh/key.pem After trying for a while pgAdmin 4 fails with: unable to connect to server: Failed to create the SSH Tunnel. Error: Could not establish session to SSH gateway cat ~/.pgadmin/pgadmin4.log Just gives me:

ERROR	pgadmin:	Could not establish session to SSH gateway
Traceback (most recent call last):
  File "/usr/pgadmin4/web/pgadmin/utils/driver/psycopg3/server_manager.py", line 610, in create_ssh_tunnel
    self.tunnel_object.start()
  File "/usr/pgadmin4/venv/lib/python3.10/site-packages/sshtunnel.py", line 1331, in start
    self._raise(BaseSSHTunnelForwarderError,
  File "/usr/pgadmin4/venv/lib/python3.10/site-packages/sshtunnel.py", line 1174, in _raise
    raise exception(reason)
sshtunnel.BaseSSHTunnelForwarderError: Could not establish session to SSH gateway

I'm really lost on how to proceed given *it works* via the terminal. So clearly not some security group issue on AWS's side. I've tried deleting ~/.pgadmin and trying again, but same result. Any help appreciated thanx. In case this helps:

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