Hi @sturakov,
Can you take a quick screenshot of the error you are seeing?
I had worked with a user previously on connecting to rsync.net. That user had created a test user for me to use and this was the link information that I used to successfully link and sync:
Name: rsync.net
Type: Internet Accessible SFTP Server
Host: [test username].rsync.net
Start Path: /data1/home/[owner username]/[test username]
Max Concurrent Connections: 3