After dht upgrade in bug #233729 transmission-daemon silently exits, I even can't get any logs.
I have the same problem. When starting transmission it just exists almost immediately without any warnings/errors.
The fix is in the phab already, I will commit as soon it get approved.
A commit references this bug:
Date: Sat Dec 29 07:18:51 UTC 2018
New revision: 488657
net-p2p/tranmission-cli: fix build due to devel/jech-dht update to v0.25.
- bump PORTREVISION of the affected SLAVEPORTS
Reviewed by: mat (mentor)
Approved by: tcberner (mentor)
Differential Revision: https://reviews.freebsd.org/D18660