What software/OS are you running on your NAS? If you’re running some goofy software on a private tracker your client might not be whitelisted.
Besides that - this NAS is attached to your home network I assume? Is it behind a router? Are the ports you’re using for torrenting port-forwarded?
What tracker are you testing this on? A bunch of trackers will have a “Connectivity check” that will tell you whether or not your client is connectable
dingus