Ejabberd and smack handshake fail

I am running ejabberd on my cloud server and I think it works well because I can connect to it from my PC using pidgin. (ejabberdctl connected-users-number answers 1 when I connect and 0 when I am online.)

Now I am trying to connect to an if from my android app using the smack package and I am getting an IOException:

javax.net.ssl.SSLHandshakeException: Handshake failed

Caused by: javax.net.ssl.SSLProtocolException: SSL handshake aborted: ssl=0xb897c858: Failure in SSL library, usually a protocol error
error:140770FC:SSL routines:SSL23_GET_SERVER_HELLO:unknown protocol (external/openssl/ssl/s23_clnt.c:795 0xacf6bf89:0x00000000)
W/System.err﹕ at com.android.org.conscrypt.NativeCrypto.SSL_do_handshake(Native Method)
W/System.err﹕ at com.android.org.conscrypt.OpenSSLSocketImpl.startHandshake(OpenSSLSocketImpl.java:318)

      

        
        
        
      

    

this is my application code:

XMPPTCPConnectionConfiguration.Builder config = XMPPTCPConnectionConfiguration.builder();
config.setSecurityMode(ConnectionConfiguration.SecurityMode.required);
config.setConnectTimeout(30000);
config.setUsernameAndPassword(username + "@" + service, password);
config.setServiceName(service);
config.setHost(host);
config.setCompressionEnabled(true);
config.setPort(port);
config.setDebuggerEnabled(true);
config.setSocketFactory(SSLSocketFactory.getDefault());

SmackConfiguration.DEBUG = true;
try {
    TLSUtils.acceptAllCertificates(config);
    XMPPTCPConnection connection = new XMPPTCPConnection(config.build());
    connection.connect();
    connection.login();

} catch (SmackException ex) {
    ex.printStackTrace();
    chatClient.setConnection(null);
} catch(IOException ex){
    ex.printStackTrace();
    chatClient.setConnection(null);                 
} catch ( XMPPException ex){
    ex.printStackTrace();
    chatClient.setConnection(null);                 
}catch (NoSuchAlgorithmException ex) {
    ex.printStackTrace();
    chatClient.setConnection(null);
}catch (KeyManagementException ex) {
    ex.printStackTrace();
    chatClient.setConnection(null);
}
return null;

      

        
        
        
      

    

I am very grateful for any help!