Connessione socket client/server non riuscita

Ciao a tutti!
Sto cercando di sviluppare una semplice app client/server usando socket. Ho trovato in rete un esempio ma mi visualizza il seguente errore

01-06 17:46:36.692 3251-9962/com.example.androidclient W/System.err: java.net.ConnectException: failed to connect to /10.0.2.15 (port 8080): connect failed: ECONNREFUSED (Connection refused)
01-06 17:46:36.692 3251-9962/com.example.androidclient W/System.err: at libcore.io.IoBridge.connect(IoBridge.java:114)
01-06 17:46:36.692 3251-9962/com.example.androidclient W/System.err: at java.net.PlainSocketImpl.connect(PlainSocketImpl.j ava:192)
01-06 17:46:36.692 3251-9962/com.example.androidclient W/System.err: at java.net.PlainSocketImpl.connect(PlainSocketImpl.j ava:172)
01-06 17:46:36.702 3251-9962/com.example.androidclient W/System.err: at java.net.Socket.startupSocket(Socket.java:566)
01-06 17:46:36.702 3251-9962/com.example.androidclient W/System.err: at java.net.Socket.tryAllAddresses(Socket.java:127)
01-06 17:46:36.702 3251-9962/com.example.androidclient W/System.err: at java.net.Socket.<init>(Socket.java:177)
01-06 17:46:36.702 3251-9962/com.example.androidclient W/System.err: at java.net.Socket.<init>(Socket.java:149)
01-06 17:46:36.702 3251-9962/com.example.androidclient W/System.err: at com.example.androidclient.MainActivity$MyClientTas k.doInBackground(MainActivity.java:91)
01-06 17:46:36.702 3251-9962/com.example.androidclient W/System.err: at com.example.androidclient.MainActivity$MyClientTas k.doInBackground(MainActivity.java:70)
01-06 17:46:36.702 3251-9962/com.example.androidclient W/System.err: at android.os.AsyncTask$2.call(AsyncTask.java:264)
01-06 17:46:36.702 3251-9962/com.example.androidclient W/System.err: at java.util.concurrent.FutureTask$Sync.innerRun(Futu reTask.java:305)
01-06 17:46:36.702 3251-9962/com.example.androidclient W/System.err: at java.util.concurrent.FutureTask.run(FutureTask.jav a:137)
01-06 17:46:36.702 3251-9962/com.example.androidclient W/System.err: at android.os.AsyncTask$SerialExecutor$1.run(AsyncTas k.java:208)
01-06 17:46:36.702 3251-9962/com.example.androidclient W/System.err: at java.util.concurrent.ThreadPoolExecutor.runWorker( ThreadPoolExecutor.java:1076)
01-06 17:46:36.702 3251-9962/com.example.androidclient W/System.err: at java.util.concurrent.ThreadPoolExecutor$Worker.run (ThreadPoolExecutor.java:569)
01-06 17:46:36.702 3251-9962/com.example.androidclient W/System.err: at java.lang.Thread.run(Thread.java:856)
01-06 17:46:36.702 3251-9962/com.example.androidclient W/System.err: Caused by: libcore.io.ErrnoException: connect failed: ECONNREFUSED (Connection refused)
01-06 17:46:36.702 3251-9962/com.example.androidclient W/System.err: at libcore.io.Posix.connect(Native Method)
01-06 17:46:36.702 3251-9962/com.example.androidclient W/System.err: at libcore.io.BlockGuardOs.connect(BlockGuardOs.java: 85)
01-06 17:46:36.702 3251-9962/com.example.androidclient W/System.err: at libcore.io.IoBridge.connectErrno(IoBridge.java:127 )
01-06 17:46:36.702 3251-9962/com.example.androidclient W/System.err: at libcore.io.IoBridge.connect(IoBridge.java:112)

Qualcuno può aiutarmi?

Spostato in sezione programmazione.