JTS3ServerMod 6.4.1 Hosting Edition (25.06.2017) Instance Manager started...
Writing InstanceManager log file to: /root/bots/JTS3ServerMod_InstanceManager.log
Loading InstanceManager config file from: /root/bots/config/JTS3ServerMod_InstanceManager.cfg
Bot chat command !exec is enabled!
Successfully connected to MySQL server for logging!
MySQL mode enabled!
Route to licence server not found!
JTS3ServerMod licence is not valid, quitting now...
root@fts-bots-backend:~/bots#
As long as you can open the Licence Manager page with your licence key, there is no issue on my end.
Check this:
https://www.stefan1200.de/forum/index.php?topic=537.0