Thank Dario ,
I read log file , it write : "2007-11-03 12:05:53,638 [3304] INFO Lightstreamer.DotNet.Server.NetworkedServerStarter [(null)] - Connecting... "
"2007-11-03 12:05:53,794 [1064] WARN Lightstreamer.DotNet.Server.NetworkedServerStarter [(null)] - Connection failed, retrying in 10 seconds..." . And i used command netstat - a then it show : "TCP sw-19:2724 sw-19.abcde.com.vn:6663 SYN_SENT" or "TCP sw-19:2828 sw-19.abcde.com.vn:6661 SYN_SENT"
I dont understand why it not working