Network / firewall ?

AssertionError: assert   
    HANGED ATTACH, STDOUT: Records affected: 0
    HANGED ATTACH, STDERR: Statement failed, SQLSTATE = 42000
    HANGED ATTACH, STDERR: Execute statement error at isc_dsql_fetch :
  - HANGED ATTACH, STDERR: <found pattern about closed connection>
  + HANGED ATTACH, STDERR: 335544921 : Execute statement error at attach :
  + HANGED ATTACH, STDERR: 335544421 : connection rejected by remote interface
  + .*Data source
  + HANGED ATTACH, STDERR: 335544842 : At procedure 'SP_UNREACHABLE' line: 3, col: 9
    HANGED ATTACH, STDERR: Statement : select u.unreachable_address from sp_unreachable as u
    .*Data source
    HANGED ATTACH, STDERR: -At procedure 'SP_GET_DATA' line: 3, col: 9
  - HANGED ATTACH, STDERR: <found pattern about failed statement>
  - HANGED ATTACH, STDERR: <found pattern about closed connection>
  - HANGED ATTACH, STDERR: <found pattern about failed statement>
  - HANGED ATTACH, STDERR: <found pattern about closed connection>
    KILLER ATT

[...SKIPPED...]

55 E         - KILLER ATTACH, STDOUT: select * from sp_get_data
2026-01-29 07:31:57.755 E         - KILLER ATTACH, STDOUT: Records affected: 1
2026-01-29 07:31:57.755 E         + KILLER ATTACH, STDOUT: Records affected: 0
2026-01-29 07:31:57.755 E           KILLER ATTACH, STDOUT: ITERATION_NO 2
2026-01-29 07:31:57.755 E           KILLER ATTACH, STDOUT: HANGING_ATTACH_CONNECTION <null>
2026-01-29 07:31:57.755 E           KILLER ATTACH, STDOUT: HANGING_ATTACH_PROTOCOL <null>
2026-01-29 07:31:57.755 E           KILLER ATTACH, STDOUT: HANGING_STATEMENT_STATE <null>
2026-01-29 07:31:57.755 E           KILLER ATTACH, STDOUT: Records affected: 0
2026-01-29 07:31:57.755
2026-01-29 07:31:57.755 tests\bugs\core_5685_test.py:224: AssertionError
2026-01-29 07:31:57.755 ---------------------------- Captured stdout setup ----------------------------
2026-01-29 07:31:57.755 Creating db: localhost:R:\Temp\qa\fbqa\test_11172\test.fdb [page_size=None, sql_dialect=None, charset='NONE', user=SYSDBA, password=masterkey]