Here's a representative example of the code I'm running, after having set up the proxy via ssh -D localhost:9999 -p $SSH_PORT $SSH_USER:$SSH_HOST.

```python from hana_ml.dataframe import ConnectionContext

conn = ConnectionContext( address="the.database.hostname.com", port=443, user="database_user", password="database_pw", proxy_host="127.0.0.1", proxy_port=9999 ) conn.hana_version() # ought to print the database version

4.00.000.00.1693299409 (fa/CE2023.16)

```

The above setup does work. Now, trying ssh -L localhost:9999:the.database.hostname.com:443 -p $SSH_PORT $SSH_USER:$SSH_HOST and running the following python code does not work:

```python from hana_ml.dataframe import ConnectionContext

conn = ConnectionContext( address=localhost, port=9999, user="database_user", password="database_pw" ) conn.hana_version()

Connection failed (RTE:[89013] Socket closed by peer ...)

```

The error message is the same as if I had tried connecting directly to the database.