Network / firewall ?

failed on teardown with "firebird.driver.types.DatabaseError: Unable to complete network request to host "localhost".
-Failed to establish a connection."

LOG DETAILS:

2025-03-25 12:59:40.571
2025-03-25 12:59:40.571 act = <firebird.qa.plugin.Action object at [hex]>
2025-03-25 12:59:40.571
2025-03-25 12:59:40.571     @pytest.mark.version('>=3.0')
2025-03-25 12:59:40.571     def test_1(act: Action):
2025-03-25 12:59:40.571         script = f"""
2025-03-25 12:59:40.571             create database '{act.db.dsn}' user '{act.db.user}'
2025-03-25 12:59:40.571               password '{act.db.password}' set names 'win1251' default character set utf8 ;
2025-03-25 12:59:40.571             set list on ;
2025-03-25 12:59:40.571             select c.rdb$character_set_name as client_char_set, r.rdb$character_set_name as db_char_set
2025-03-25 12:59:40.571             from mon$attachments a join rdb$character_sets c on a.mon$character_set_id = c.rdb$character_set_id
2025-03-25 12:59:40.571             cross join rdb$database r
2025-03-25 12:59:40.571             where a.mon$attachment_id = current_connection ;
2025-03-25 12:59:40.571         """
2025-03-25 12:59:40.571         act.expected_stdout = expected_stdout
2025-03-25 12:59:40.571         act.isql(switches = ['-q'], input=script, connect_db=False, combine_output = True)
2025-03-25 12:59:40.572 >       assert act.clean_stdout == act.clean_expected_stdout
2025-03-25 12:59:40.572 E       assert
2025-03-25 12:59:40.572 E         - CLIENT_CHAR_SET                 WIN1251
2025-03-25 12:59:40.572 E         - DB_CHAR_SET                     UTF8
2025-03-25 12:59:40.572 E         + Statement failed, SQLSTATE = 08006
2025-03-25 12:59:40.572 E         + Unable to complete network request to host "localhost".
2025-03-25 12:59:40.572 E         + -Failed to establish a connection.
2025-03-25 12:59:40.572
2025-03-25 12:59:40.572 tests\functional\database\create\test_01.py:38: AssertionError