Network / firewall ?

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

LOG DETAILS:

2025-07-20 18:12:09.139
2025-07-20 18:12:09.139 act_db_main = <firebird.qa.plugin.Action object at [hex]>
2025-07-20 18:12:09.139 act_db_repl = <firebird.qa.plugin.Action object at [hex]>
2025-07-20 18:12:09.139 db_main_nbk0 = WindowsPath('H:/QA/temp/qa2024.tmp/fbqa/test_12097/tmp_db_main.nbk0')
2025-07-20 18:12:09.139 db_main_nbk1 = WindowsPath('H:/QA/temp/qa2024.tmp/fbqa/test_12097/tmp_db_main.nbk1')
2025-07-20 18:12:09.139 capsys = <_pytest.capture.CaptureFixture object at [hex]>
2025-07-20 18:12:09.139
2025-07-20 18:12:09.139     @pytest.mark.replication
2025-07-20 18:12:09.139     @pytest.mark.version('>=4.0.3')
2025-07-20 18:12:09.139     def test_1(act_db_main: Action,  act_db_repl: Action, db_main_nbk0: Path, db_main_nbk1: Path, capsys):
2025-07-20 18:12:09.139
2025-07-20 18:12:09.139         out_prep, out_main, out_drop = '', ''

[...SKIPPED...]

n(dpb), dpb)
2025-07-20 18:12:09.152 >       self._check()
2025-07-20 18:12:09.152
2025-07-20 18:12:09.152 C:\Python3x\Lib\site-packages\firebird\driver\interfaces.py:1300:
2025-07-20 18:12:09.152 _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
2025-07-20 18:12:09.152
2025-07-20 18:12:09.152 self = <firebird.driver.interfaces.iProvider object at [hex]>
2025-07-20 18:12:09.153
2025-07-20 18:12:09.153     def _check(self) -> None:
2025-07-20 18:12:09.153         state = self.status.get_state()
2025-07-20 18:12:09.153         if StateFlag.ERRORS in state:
2025-07-20 18:12:09.153 >           raise self.__report(DatabaseError, self.status.get_errors())
2025-07-20 18:12:09.153 E           firebird.driver.types.DatabaseError: Unable to complete network request to host "localhost".
2025-07-20 18:12:09.153 E           -Failed to establish a connection.
2025-07-20 18:12:09.153
2025-07-20 18:12:09.153 C:\Python3x\Lib\site-packages\firebird\driver\interfaces.py:113: DatabaseError