Linux without internet mode

i have some problems with linux without gui. when i try to start urbackup on the debian i have installed it say
“2019-03-25 03:40:47: ERROR: Internet mode not enabled. Please set “internet_mode_enabled” to “true”” and i dont know where i need to change this?

somewhere like /etc/default/urbackup

If you add a client on the server it shows you the commands you need to run on the client to configure the client.

From console, I configure the particular backup for my client in linux without gui and work perfectly