Android客户端连接失败

D/JIGUANG-JCore: [ConnectingHelper] To get sis - host:s.jpush.cn, port:19000
08-16 14:44:00.955 27447-27600/com.example.duan.chao I/JIGUANG-JCore: [ReportHelper] periodTasks...
08-16 14:44:00.960 27447-27599/com.example.duan.chao D/JIGUANG-JCore: [JiguangTcpManager] Send heart beat
08-16 14:44:03.800 27447-13877/com.example.duan.chao W/JIGUANG-JCore: [ConnectingHelper] Get sis info error - sisHost:s.jpush.cn
 java.lang.Exception: Failed to resolve host dns - s.jpush.cn
 at cn.jiguang.b.d.c.a(Unknown Source)
 at cn.jiguang.b.b.g.run(Unknown Source)
 at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1113)
 at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:588)
 at java.lang.Thread.run(Thread.java:818)