impyla: Failure to connect to cluster without error message

I’m trying to use impyla to connect to a hive server:

from impala.dbapi import connect
conn = connect(host='localhost', port=11112)
cursor = conn.cursor()

I locks up on the conn.cursor() line. No timeouts so far (1h+) and no connection or failure.

Not sure if related, but I can connect using pyhive and directly using beeline. Using pyhive I can do show databases but get an error when trying to do a SELECT. The beeline connection line is

beeline -u jdbc:hive2://localhost:11112 -n hive job.queue.name=myqueue

and everything works ok.