java - TCPConnection refusing connection -


i have standard client/server model , server binds client can not connect , keeps saying connection has been refused. (stacktrace above client code)

i have put computer on dmz ports , open have disabled firewalls.

the following code works fine on localhost , local network address not external ip

for instance serverip string 0.0.0.0 in reality real ip address.

canyouseeme.org success: can see service on 0.0.0.0 on port (25565) isp not blocking port 25565 succeeds when server running

edit: added line of code server see sending data , if being received.

when canyouseeme.org pings 25565 sends null data gives me ip address sent correct pointing towards client error

client stacktrace

java.net.connectexception: connection refused: connect     @ java.net.dualstackplainsocketimpl.connect0(native method)     @ java.net.dualstackplainsocketimpl.socketconnect(unknown source)     @ java.net.abstractplainsocketimpl.doconnect(unknown source)     @ java.net.abstractplainsocketimpl.connecttoaddress(unknown source)     @ java.net.abstractplainsocketimpl.connect(unknown source)     @ java.net.plainsocketimpl.connect(unknown source)     @ java.net.sockssocketimpl.connect(unknown source)     @ java.net.socket.connect(unknown source)     @ java.net.socket.connect(unknown source)     @ java.net.socket.<init>(unknown source)     @ java.net.socket.<init>(unknown source)     @ main.client.run(client.java:29)     @ java.lang.thread.run(unknown source)

client code

    synchronized (runner)     {         while (true)         {             string sentence;             string modifiedsentence;             try             {                 bufferedreader infromuser = new bufferedreader(new inputstreamreader(system.in)); /*line 29:*/                socket clientsocket = new socket(serverip, 25565);                 dataoutputstream outtoserver = new dataoutputstream(clientsocket.getoutputstream());                 bufferedreader infromserver = new bufferedreader(new inputstreamreader(clientsocket.getinputstream()));                 sentence = infromuser.readline();                 outtoserver.writebytes(sentence + '\n');                 modifiedsentence = infromserver.readline();                 system.out.println("from server: " + modifiedsentence);                 clientsocket.close();             }             catch (ioexception e)             {                 e.printstacktrace();             }          }     }

server code

synchronized (runner)     {         while (true)         {             string clientsentence;             string capitalizedsentence;             serversocket welcomesocket = null;             try             {                 welcomesocket = new serversocket(25565);                  while (true)                 {                     socket connectionsocket = welcomesocket.accept();                     bufferedreader infromclient =                             new bufferedreader(new inputstreamreader(connectionsocket.getinputstream()));                     dataoutputstream outtoclient = new dataoutputstream(connectionsocket.getoutputstream());                     clientsentence = infromclient.readline();                     if(clientsentence == null) clientsentence = "recieved null packet";                     clientsentence = connectionsocket.getinetaddress().gethostaddress().replace("/", "") + " " + clientsentence;                     system.out.println("received: " + clientsentence);                     capitalizedsentence = clientsentence.touppercase() + '\n';                     outtoclient.writebytes(capitalizedsentence);                 }             }             catch (exception e)             {                 e.printstacktrace();                 try                 {                     welcomesocket.close();                 }                 catch (ioexception e1)                 {                     e1.printstacktrace();                 }             }         }     }


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