问使用parse.com的安卓应用程序中出现无法连接到推送服务器错误

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11-22 05:43:17.619: E/com.parse.PushService(5060): could not connect to push server
11-22 05:43:17.619: E/com.parse.PushService(5060): java.net.SocketTimeoutException: Connection timed out
11-22 05:43:17.619: E/com.parse.PushService(5060):  at org.apache.harmony.luni.platform.OSNetworkSystem.connect(Native Method)
11-22 05:43:17.619: E/com.parse.PushService(5060):  at dalvik.system.BlockGuard$WrappedNetworkSystem.connect(BlockGuard.java:357)
11-22 05:43:17.619: E/com.parse.PushService(5060):  at org.apache.harmony.luni.net.PlainSocketImpl.connect(PlainSocketImpl.java:204)
11-22 05:43:17.619: E/com.parse.PushService(5060):  at org.apache.harmony.luni.net.PlainSocketImpl.connect(PlainSocketImpl.java:437)
11-22 05:43:17.619: E/com.parse.PushService(5060):  at java.net.Socket.connect(Socket.java:1002)
11-22 05:43:17.619: E/com.parse.PushService(5060):  at com.parse.PushService$2.doInBackground(PushService.java:468)
11-22 05:43:17.619: E/com.parse.PushService(5060):  at com.parse.PushService$2.doInBackground(PushService.java:428)
11-22 05:43:17.619: E/com.parse.PushService(5060):  at com.parse.os.ParseAsyncTask$2.call(ParseAsyncTask.java:215)
11-22 05:43:17.619: E/com.parse.PushService(5060):  at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:306)
11-22 05:43:17.619: E/com.parse.PushService(5060):  at java.util.concurrent.FutureTask.run(FutureTask.java:138)
11-22 05:43:17.619: E/com.parse.PushService(5060):  at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1088)
11-22 05:43:17.619: E/com.parse.PushService(5060):  at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:581)
11-22 05:43:17.619: E/com.parse.PushService(5060):  at java.lang.Thread.run(Thread.java:1019)