UDP Address already in use?

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I am following the UDP tutorials at http://docs.oracle.com/javase/tutorial/networking/datagrams/broadcasting.html ,I have copied all the code and compiled it, now If I compile the client first and then the server, the server prints this out in console

Exception in thread "main" java.net.BindException: Address already in use: Cannot bind
at java.net.PlainDatagramSocketImpl.bind0(Native Method)
at java.net.PlainDatagramSocketImpl.bind(Unknown Source)
at java.net.DatagramSocket.bind(Unknown Source)
at java.net.DatagramSocket.<init>(Unknown Source)
at java.net.DatagramSocket.<init>(Unknown Source)
at java.net.DatagramSocket.<init>(Unknown Source)
at QuoteServerThread.<init>(QuoteServerThread.java:19)
at MulticastServerThread.<init>(MulticastServerThread.java:10)
at MulticastServer.main(MulticastServer.java:3)

QuoteServerThread line 19 is

socket = new DatagramSocket(12345);

MulticastServerThread line 10 is

public MulticastServerThread() throws IOException {
    super("MulticastServerThread"); // line 10
}

MulticastServer line 3 is

public class MulticastServer {
    public static void main(String[] args) throws java.io.IOException {
        new MulticastServerThread().start(); // line 3
    }
}

If I start the server first, then the client, the client prints out this in console

Exception in thread "main" java.net.BindException: Address already in use: Cannot bind
at java.net.PlainDatagramSocketImpl.bind0(Native Method)
at java.net.PlainDatagramSocketImpl.bind(Unknown Source)
at java.net.DatagramSocket.bind(Unknown Source)
at java.net.MulticastSocket.<init>(Unknown Source)
at java.net.MulticastSocket.<init>(Unknown Source)
at MulticastClient.main(MulticastClient.java:9)

MulticastClient line 9 is

MulticastSocket socket = new MulticastSocket(12345);

Looking at the errors, it seems to me that it is something to do with listening to ports, how can I go about fixing this?

Canvas


This is likely because you are already running an instance of the server. Only one server can listen on a given port at a time. Check to see if you are already running an instance (if you are using Eclipse, you should see this in the command window) and terminate it before running another instance.

Though it is also possible that a stream was not shut down properly. If you are running an IDE, restarting the IDE should fix the problem, though occasionally I have had to restart my computer. Probably a better solution to fix this, but that is what has worked for me.

"Address already in use": I'm misunderstanding UDP, It is possible for two programs to listen on the same UDP port, but both programs have to specify that they want to allow the port to be shared. Here is an excerpt  Currently the udp::socket constructor signature you're using will cause the socket to bind immediately. Unfortunately, you need to set the reuse_address option first before binding. To do that, try this intead:


You can do the following:

Use netstat coomand to view which application is using that port. Then use tasklist and taskkill to kill the application at that port.

Bind: Address Already in Use, Bind: Address Already in Use. Or How to Avoid this Error when Closing TCP Connections. Normal Closure. In order for a network connection to close, both ends  Hi @intmainvoid, did you find a solution for this?I'm using the CocoaAsyncSocket. This issue happens very often to my app when another app is also using UDP and being kill by OS in the background(you can see from the multi-task screen).


Possibly what happens is that you have on the client side two wires that connect to the same port. When you receive a message from the server, the client machine does not know what thread to redirect the message since they have two different DatagramSocket tips pointing to the same port

netcat udp address already in use, A process is probably already listening on UDP port 2947. You can get the PID of the process by running: fuser -n udp 2947. Or browse the list of listening UDP  java.net.BindException: Address already in use It has to do with the port that I try to open in use, but I do so with any port you try, 80, 8080, 12345. Even watch online command ports were free, but if you tell me who are equally busy. netstat -a The code is : Sender


Bug 711 – error: can't bind udp socket: Address already in use, hello NSD can't start if multiple interface(ip-address) are specified and debug-​mode is not enabled. I use nsd-4.1.5 version and daemontools as supervisor. Envoyé : mercredi, 17. mai 2017 10:33 À : net-snmp-users@ Objet : couldn't open udp:162 -- errno 98 ("Address already in use") Hi Experts, I am trying to receive a trap generated by a cisco router on my VM- Ubuntu 14.04. I can do a snmwalk so I guess snmp is working fine but I am not able to receive the traps generated by router on my VM.


Binding Error, This issue happens very often to my app when another app is also using UDP and being kill by OS in the background(you can see from the multi-  The UDP Receive block receives data over a UDP network from a remote device. It can receive data by using the connection between the development and target computers or by using a dedicated Ethernet card. If you use a dedicated Ethernet card, add a UDP Configure block to your model.


Receiving "Address Already in Use" error when binding two sockets , listen udp :30303: bind: address already in use #2538. Closed. scyclow opened this issue on Jun 16, 2017 · 12 comments. Closed  Address already in use means that the port you are trying to allocate for your current execution is already occupied/allocated to some other process. If you are a developer and if you are working on an application which require lots of testing, you might have an instance of your same application running in background (may be you forgot to stop it properly)