It seems "service tincd restart" bring up tincd too early before previous tincd process is stopped: $ sudo service tincd restart Password: Stopping tincd for: wmnet tincd already running? (pid=30017). $ echo $? 1 $ sudo service tincd start Starting tincd for: wmnet Maybe the rc.d script should wait for tincd to stop?
A commit references this bug: Author: dinoex Date: Mon Apr 29 08:34:08 UTC 2019 New revision: 500398 URL: https://svnweb.freebsd.org/changeset/ports/500398 Log: - fix restart when shutdown is slow PR: 228357 Reported by: CUI Hao Changes: head/security/tinc/files/tincd.in head/security/tinc-devel/files/tincd.in