Hi Marvin,
I assume you are on a LAN where you can ping your TRUENAS, so lets see if we can get it running in a few quick posts.
Please run this command on your NAS and then post the command and output:
rclone rcd --rc-web-gui --rc-web-gui-no-open-browser -vv
also please show that you have connection from your PC to the NAS by executing and posting the output from executing this on your PC:
ping xxx.xxx.xxx.xxx # The IP or hostname of your NAS
Advanced tip: The trick is to replace the local host 127.0.0.1 with the IP of your NAS when connecting from your PC, and make sure that the port used is open in the firewall of your NAS, or change to an unused open port by using something like --rc-addr :443