Server TAC file test fails with "Connection refused"

From: https://0xacab.org/leap/soledad/-/jobs/26463

=================================== FAILURES ===================================
_______ TacServerTestCase.test_local_public_default_ports_on_server_tac ________
NOTE: Incompatible Exception Representation, displaying natively:

ConnectionRefusedError: Connection was refused by other side: 111: Connection refused.

!!!!!!!!!!!!!!!!!!!! Interrupted: stopping after 1 failures !!!!!!!!!!!!!!!!!!!!