Connection failure between tabris android client and server?

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http://stackoverflow.com – i have the problem that the tabris android client don´t connect to the server. For Example i stop the server and start him again the android client can´t connect with the server. After a few times start and stop the server the android client can reconnect to the server. When i use a tomcat server i must restart them that the android clients can reconnect. The ios client has no problems in this context. Is this a bug ? The android logs show me the following: Could not connect to xxx com.eclipsesource.tabris.android.core.transport.TransportException: Could not connect to xxx at com.ecl (HowTos)