Respondendo à minha propria pergunta :)

http://answer.techwikihow.com/920739/pg_hba-conf-client-side-fatal-error.html

/You are missing allow entries for ipv6, you only allow localhost over ipv6.
You should add ::/0 (all addresses) or 2000::/3 (all routable addresses) as
well.
/

tem a ver com a definições no pg_hba.conf do Postgres/postgis para uma range
de IPV6<quote 




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