I didn't know about this option in FD.
There is no information about the "Heartbeat interval" in reference part
"Client Initiated Connection":
To only allow Connection From the Client to the Director use:
Connection From Director To Client Dir Client = no
Connection From Client To Director Dir Client = yes
Heartbeat Interval Dir Client = 60 # to keep the network connection established
Connection From Director To Client Fd Director = no
Connection From Client To Director Fd Director = yes
I set this option (Heartbeat interval in FD Client), and now everything works
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