There is an issue with transmission-cli, which has been updated from 3.00-2 to 3.00-3.
It’s not possible to connect to the transmission server from a remote machine, you get “Unauthroized user”.
I downgraded to 3.00-2 version and i no longer have this issue anymore.
You can find a thread on that point on archlinuxarm forum transmission-cli 3.00-3 unauthroized user