Same problem with NAKIVO Appliance and Transporter + Repository on SYNOLOGY
Same trick wor like a charm BUT:
First stage on SYNOLOGY /volume1/@appstore/NBR-Transporter#
./nkv-bhsvc stop
./bhsvc -b "<UsePassword>"
Aftter these restart Service from Synology console
Connect to NAKIVO Console , edit Transporter , Connect .et voila :))