Linux Error On Binding Address Already In Use
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Address Already In Use Python
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Error Binding Socket Address Already In Use
Overflow Community Stack Overflow is a community of 6.2 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up Python: Binding Socket: “Address already in use” how to use so_reuseaddr up vote 38 down vote favorite 10 I have a question regarding client socket on TCP/IP network. Let's say I use try: comSocket = socket.socket(socket.AF_INET, socket.SOCK_STREAM) comSocket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1) except socket.error, msg: sys.stderr.write("[ERROR] %s\n" % msg[1]) sys.exit(1) try: comSocket.bind(('', 5555)) comSocket.connect() except socket.error, msg: sys.stderr.write("[ERROR] %s\n" % msg[1]) sys.exit(2) The socket created will be bound to port 5555. The problem is that after ending the connection bind address already in use ssh comSocket.shutdown(1) comSocket.close() Using wireshark, I see the socket closed with FIN,ACK and ACK from both sides, I can't use the port again. I get the following error: [ERROR] Address already in use I wonder how can I clear the port right away so that next time I still can use that same port. comSocket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1) setsockopt doesn't seem to be able to resolve the problem Thank you! python sockets tcp port share|improve this question edited Dec 31 '13 at 19:49 asked Jun 17 '11 at 0:12 Tu Hoang 97872235 Why does a client need a specific port? –AJ. Jun 17 '11 at 0:17 Because I have to put that into a production server, and in that server, all outgoing connections are blocked. I need to specify a specific port to the socket so that they can set up a rule on the firewalls that allows the connection to go through. –Tu Hoang Jun 17 '11 at 0:46 I suggest you copy & paste the actual code. What you wrote above has an obvious error that would prevent you from seeing the behavior you claim to have seen. This leaves readers with
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Bind Failed Address Already In Use Iperf
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Address Already In Use Socket
can ask a question Anybody can answer The best answers are voted up and rise to the top ssh -L (error: bind: Address already in use) up vote 9 down vote favorite 5 Pretty simple, I know that this has happened http://stackoverflow.com/questions/6380057/python-binding-socket-address-already-in-use to me before. Couldn't find a good answer on AU. I was running an ssh session with ports bound: ssh -L 3000:
// ln is listening on :8080 err = ln.Close() // succeeds, no error if err != nil { log.Fatal(err) } ln2, err := net.Listen("tcp", https://forum.golangbridge.org/t/bind-address-already-in-use-even-after-listener-closed/1510 ":8080") if err != nil { log.Fatal(err) // bind: address already in use } I was wondering if SO_REUSEADDR had something to do with this, but as far as I know, that is already http://developerweb.net/viewtopic.php?id=4605 being used under the hood in the Go standard library when creating a new tcp listener. Any ideas how I can re-bind to that address without delay? jdh (Joe Henke) 2015-11-14 18:40:19 UTC address already #2 Hey Matt, I tried to reproduce this and did not on my mac but did on the go playground. Where did this happen for you? Interestingly, both on my mac and on the go playground, if you use -addr="" or change to defaultAddr to "" in the source (which I think just means it will bind to any open port, yeah?) it will never rebind address already in to the same port, and in fact will bind to the previous attempt's port + 1. Not sure if this is significant; I don't know precisely what binding to "" is specced to do. Joe matt (Matt Holt) 2015-11-14 19:09:42 UTC #3 Thanks for trying to reproduce it - next time I'll try to provide a full code sample I'm experiencing the Go playground's behavior on my Mac. But when I ran your test program on my Mac, it passed. I will look into this further in my own program. Meanwhile, I am intensely curious as to why the test fails on the Go playground... matt (Matt Holt) 2015-11-14 19:57:23 UTC #4 Okay, I've narrowed it down a little bit. This only happens for me when my program has restarted itself using exec.Command(os.Args[0], ...) and, in that command, it sets ExtraFiles to a list of file descriptors for listeners. (Similar to this method: http://grisha.org/blog/2014/06/03/graceful-restart-in-golang/) This lets the child process (itself) use the existing listeners without downtime. In the "restarted" process, then: I close the listeners, immediately create new ones on the same addresses again, and it fails with "address already in use". But if I pause 5 s
#1 2006-09-07 08:05 AM kiranmai Member Registered: 2006-09-07 Posts: 2 Re: Bind() failed: Address already in use Hi, I am getting Bind Failed: Address already in use I have added int yes=1; if (setsockopt(gTestSocket,SOL_SOCKET,SO_REUSEADDR,&yes,sizeof(int)) == -1) { perror("setsockopt"); return FALSE; } Still Iam getting the same error. Offline Quote #2 2006-09-07 01:15 PM RobSeace Administrator From: Boston, MA Registered: 2002-06-12 Posts: 3,825 Website Re: Bind() failed: Address already in use Then, you probably have some other program (maybe another copy of the same one?) already bound to that port... Do "netstat -a" and look for it... Setting SO_REUSEADDR only lets you bind() if there are no other truly active listening sockets for that port... Typically, the only real use for it is to be able to bind() when there are still TIME_WAIT state sockets bound to that port, from a previous incarnation of the server... But, it won't let two active apps bind() to the same port (on the same IP), if that's what you're trying to do... Offline Quote #3 2006-09-08 05:21 AM kiranmai Member Registered: 2006-09-07 Posts: 2 Re: Bind() failed: Address already in use Hi RobSeace Thanks for your reply. Actually i have terminated the program abnormally using ctrl+z. So the socket was not closed. Now if I run the program again it gives bind() failed:address already in use. when i do netstat -a it gives that, that particular socket is connected but not listening. I think i need to do some clean up to close the socket when the program terminated abnormally.. Is there any unix command that kills or closes the socket from command prompt. Offline Quote #4 2006-09-08 01:17 PM RobSeace Administrator From: Boston, MA Registered: 2002-06-12 Posts: 3,825 Website Re: Bind() failed: Address already in use Well, in most shells, CTRL-Z doesn't terminate an app, but rather suspends it... Ie: it's still alive, but just 'stopped', and can be restarted again with "bg" or "fg"... So, your app is still alive and holding the socket open... If your app truly terminated, then the OS would've closed the socket for you automatically... Is there any unix command that kills or closes the socket from command prompt. Well, it doesn't make sense to talk about killing a socket... You can kill the app that has the socket open, however... Just use "kill" or "killall" or whatever... Doing that will close the socket... Offline Quote #5 200