Using Transmission Remote with EX2 Ultra


I am a fresh new owner of a an EX2 Ultra, and I was trying to use Transmission Remote with it. I successfully installed app from NAS webpage and can regularly access to Transmission webpage, adding torrents and so on.
But I can’t connect to it using Transmission Remote. So my questions: is auth needed (from webpage it sounds not)? If yes, which credentials to use (I remember transmission server uses its own).

Thanks in advance

Surfing the web I understood that RPC must be enabled with credentials, so settings.json in installation folder should be modified accordingly. In principle, this should be done from configuration panel in NAS settings.