tds_fdw
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ERROR: DB-Library error: DB #: 20009, DB Msg: Unable to connect: Adaptive Server is unavailable or does not exist, OS #: 111, OS Msg: Connection refused, Level: 9 SQL state: HV00L
Using sql server developer edition. Works with sql server enterprise edition.
Connection refused generally means either that nothing is listening on the port or that some firewall is blocking access.
https://serverfault.com/questions/725262/what-causes-the-connection-refused-message