one node of a cluster does not show up in Ganglia web portal -

In the ganglia, I have configured 2 groups. Cluster A. has 2 nodes, in cluster B. 13 nodes respectively. Cluster B works well, while only 1 node is shown in cluster A. The other node is the exact same gmond.conf file, which is shown below:

  global {daemonize = yes setuid = yes user = ganglia debug_level = 0 max_udp_msg_len = 1472 mute = no deaf = no Host_dmax = 0 / * sec * / cleanup_threshold = 300 / * sec * / gexec = no send_metadata_interval = 0} {cluster #name = "unspecified" name = "rpt" owner = "unspecified" LatLong = "unspecified" url = "unspecified "} {Host Space =" Unspecified "} {udp_send_channel #mcast_join = 239.2.11.71 Host = QT- DW- Master Port = 8557 TTL = 1} / * udp_recv_channel {#mcast_join = 239.2.11.71 ports = 8557 #bind = 239.2. 11.71 #bind = QT-DW-guru} * / tcp_accept_channel {port = 8557}  

gmetad.conf is shown on QT-DW-master below:

 I have tried to use multicasting, but I do not even work in the    

Log file , but failed. to anyone?

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All clusters are running gmond in one can help on this problem?