CMAN (cman.ora) auto registration failure

Hi Team,

few days back we noticed CMAN unable to register  services automatically after host reboot. as part of investigation verified with N/W team and SA team and not found any changes at N/W and SA level.

cman.ora contents as followes.

cman_1600 =

(configuration=

  (address=(protocol=tcp)(host=test-prod1-02)(port=1600)(queuesize=28000))

  (parameter_list =

    (aso_authentication_filter=off)

    (connection_statistics=yes)

    (log_directory=/oracle/product/12.1.0/OCM/network/log)

    (log_level=support)

    (max_connections=250)

    (max_reg_connections=6000)

    (max_all_connections=16000)

    (idle_timeout=0)

    (inbound_connect_timeout=5)

    (session_timeout=0)

    (outbound_connect_timeout=0)

    (max_gateway_processes=61)

    (min_gateway_processes=60)

    (remote_admin=on)