Backup client on DMZ

Telnet on port 5555 is ok, both ways

Cannot connect to Media Agent on system CELLSERVER.DOMAIN.se, port 5559 (IPC Invalid Hostname or IP Address) => aborting.

Added Cellserver in clients hostfile didn´t help at all.

    Lost connection to VBDA named "Client.DOMAIN.se [/C]"
    on host Client.DOMAIN.se.
    Ipc subsystem reports: "IPC Read Error
    System error: [10053] Software caused connection abort

Any suggestions would be appreciated!