TLS_FORWARD doesn't work with gnutls 3.3.x (default e.g. on CentOS)
kresd 3.2.0 and 2.4.1, CentOS 7
kresd: daemon/worker.c:1179: tcp_task_waiting_connection: Assertion `session_flags(session)->outgoing' failed.
Details with verbose log: https://lists.nic.cz/pipermail/knot-resolver-users/2019/000110.html
Edited by Vladimír Čunát