Network / firewall ?

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

LOG DETAILS:

2025-07-20 18:12:09.204
2025-07-20 18:12:09.204 act_db_main = <firebird.qa.plugin.Action object at [hex]>
2025-07-20 18:12:09.204 act_db_repl = <firebird.qa.plugin.Action object at [hex]>
2025-07-20 18:12:09.205 tmp_oltp_build_sql = WindowsPath('H:/QA/temp/qa2024.tmp/fbqa/test_12104/tmp_oltp_emul_ddl.sql')
2025-07-20 18:12:09.205 tmp_oltp_build_log = WindowsPath('H:/QA/temp/qa2024.tmp/fbqa/test_12104/tmp_oltp_emul_ddl.log')
2025-07-20 18:12:09.205 capsys = <_pytest.capture.CaptureFixture object at [hex]>
2025-07-20 18:12:09.205
2025-07-20 18:12:09.205     @pytest.mark.replication
2025-07-20 18:12:09.205     @pytest.mark.version('>=4.0.1')
2025-07-20 18:12:09.205     def test_1(act_db_main: Action,  act_db_repl: Action, tmp_oltp_build_sql: Path, tmp_oltp_build_log: Path, capsys):
2025-07-20 18:12:09.205
2025-07-20 18:12:09.205         if 

[...SKIPPED...]

n(dpb), dpb)
2025-07-20 18:12:09.217 >       self._check()
2025-07-20 18:12:09.217
2025-07-20 18:12:09.217 C:\Python3x\Lib\site-packages\firebird\driver\interfaces.py:1300:
2025-07-20 18:12:09.217 _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
2025-07-20 18:12:09.217
2025-07-20 18:12:09.217 self = <firebird.driver.interfaces.iProvider object at [hex]>
2025-07-20 18:12:09.217
2025-07-20 18:12:09.217     def _check(self) -> None:
2025-07-20 18:12:09.217         state = self.status.get_state()
2025-07-20 18:12:09.217         if StateFlag.ERRORS in state:
2025-07-20 18:12:09.217 >           raise self.__report(DatabaseError, self.status.get_errors())
2025-07-20 18:12:09.218 E           firebird.driver.types.DatabaseError: Unable to complete network request to host "localhost".
2025-07-20 18:12:09.218 E           -Failed to establish a connection.
2025-07-20 18:12:09.218
2025-07-20 18:12:09.218 C:\Python3x\Lib\site-packages\firebird\driver\interfaces.py:113: DatabaseError