Error Binding To Socket Address Already In Use
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Bind Socket Failed With Error Address Already In Use
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Could Not Bind Socket Address Already In Use
socket programming in unix up vote 2 down vote favorite 3 I've gone through many posts and forums and I'm new to socket programming. Major parts of my code are similar to BIND ERROR : Address already in use but then i changed my code so that i include "setsockopt" function like so: const char* port="5555"; int opt=1; portno=atoi(port); //parameters for server address serv_addr.sin_family=AF_INET; serv_addr.sin_port=htons(portno); serv_addr.sin_addr.s_addr=INADDR_ANY; //bind can't bind server socket address already in use the socket to the address setsockopt(sockfd,SOL_SOCKET,SO_REUSEADDR,(const char *)&opt,sizeof(int)); if(bind(sockfd,(struct sockaddr*)&serv_addr,sizeof(serv_addr))<0) {close(sockfd); error("error in binding port!"); } But still i get the error. I have to close the terminal and restart it in order to use the port again. I want to use a hardcoded port (like i mentioned in the code above) Thanks a lot in advance c sockets unix tcp share|improve this question edited Feb 9 '12 at 8:56 Joachim Pileborg 210k15141249 asked Feb 9 '12 at 8:53 arvind 501311 Check the value returned by setsockopt. –cnicutar Feb 9 '12 at 8:56 Are you sure you don't have a lingering process somewhere? –Laur Ivan Feb 9 '12 at 8:56 return value of setsockopt is 0 when the binding fails,however if the server is up then the return value is not displayed. –arvind Feb 9 '12 at 9:38 add a comment| 2 Answers 2 active oldest votes up vote 1 down vote accepted A port number can only be used by one application at a time. That means you can not start the same program twice expecting both to bind to the same port. The SO_REUSEADDR is for when the socket bound to an ad
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Error Binding Socket Addr='af_inet
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Error Binding Socket (3420)
Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a how to use so_reuseaddr community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up bind failed. Error: Address already in use [closed] up vote 13 down vote favorite 8 http://stackoverflow.com/questions/9207781/error-in-binding-port-address-already-in-use-tcp-socket-programming-in-unix I am new in Socket programming,Linux ,C.. This is my Bind part of the Socket program //Bind if( bind(socket_desc,(struct sockaddr *)&server , sizeof(server)) < 0) { //print the error message perror("bind failed. Error"); return 1; } puts("bind done"); But it gives user-desktop:~/socket_programming$ ./server Socket created bind failed. Error: Address already in use I don't know how to fix this problem.. Please give me a solution.. c linux sockets share|improve this question http://stackoverflow.com/questions/15198834/bind-failed-error-address-already-in-use edited Jun 17 at 8:30 Chaitanya Bapat 12315 asked Mar 4 '13 at 9:59 TamiL 1,09431230 closed as too localized by Nick, dandan78, BЈовић, EJP, Öö Tiib Mar 4 '13 at 12:08 This question is unlikely to help any future visitors; it is only relevant to a small geographic area, a specific moment in time, or an extraordinarily narrow situation that is not generally applicable to the worldwide audience of the internet. For help making this question more broadly applicable, visit the help center.If this question can be reworded to fit the rules in the help center, please edit the question. 1 Use a different port number? –Nick Mar 4 '13 at 10:01 2 Use an address that isn't already in use. –David Schwartz Mar 4 '13 at 10:02 I got it.. I choose different ports... Thanks for the help .. Thanks all. –TamiL Mar 4 '13 at 10:18 1 I faced the same issue when I closed the server program with client program still running. This put the socket into TIME_WAIT state. Here's an elaborate discussion of the problem: How to forcibly close a socket in TIME_WAIT? –Narendra Apr 5 at 6:10 add a comment| 4 Answers 4 active oldest votes up vote 12 dow
and both ends must ACK (acknowledge) each other's FIN packets. The FIN packets are initiated by the application performing a close(), a shutdown(), or an exit(). The ACKs are handled by the kernel after the http://hea-www.harvard.edu/~fine/Tech/addrinuse.html close() has completed. Because of this, it is possible for the process to complete before the kernel has released the associated network resource, and this port cannot be bound to another process until the kernel has decided that it http://unix.stackexchange.com/questions/121230/nc-bind-failed-address-already-in-use is done. Figure 1 Figure 1 shows all of the possible states that can occur during a normal closure, depending on the order in which things happen. Note that if you initiate closure, there is a TIME_WAIT state address already that is absent from the other side. This TIME_WAIT is necessary in case the ACK you sent wasn't received, or in case spurious packets show up for other reasons. I'm really not sure why this state isn't necessary on the other side, when the remote end initiates closure, but this is definitely the case. TIME_WAIT is the state that typically ties up the port for several minutes after the process has completed. The length of the address already in associated timeout varies on different operating systems, and may be dynamic on some operating systems, however typical values are in the range of one to four minutes. If both ends send a FIN before either end receives it, both ends will have to go through TIME_WAIT. Normal Closure of Listen Sockets A socket which is listening for connections can be closed immediately if there are no connections pending, and the state proceeds directly to CLOSED. If connections are pending however, FIN_WAIT_1 is entered, and a TIME_WAIT is inevitable. Note that it is impossible to completely guarantee a clean closure here. While you can check the connections using a select() call before closure, a tiny but real possibility exists that a connection could arrive after the select() but before the close(). Abnormal Closure If the remote application dies unexpectedly while the connection is established, the local end will have to initiate closure. In this case TIME_WAIT is unavoidable. If the remote end disappears due to a network failure, or the remote machine reboots (both are rare), the local port will be tied up until each state times out. Worse, some older operating systems do not implement a timeout for FIN_WAIT_2, and it is possible to get stuck there forever, in which case restarting your server could require a reboot. If the local application dies while a connection is a
here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack Overflow the company Business Learn more about hiring developers or posting ads with us Unix & Linux Questions Tags Users Badges Unanswered Ask Question _ Unix & Linux Stack Exchange is a question and answer site for users of Linux, FreeBSD and other Un*x-like operating systems. Join them; it only takes a minute: Sign up Here's how it works: Anybody can ask a question Anybody can answer The best answers are voted up and rise to the top nc: bind failed: Address already in use up vote 4 down vote favorite 1 I am trying to execute nc command from a script , my script is executing nc command on different ports of Destination using the same source port. e.g: nc -p 8140 -z -v -n 10.X.X.9 9090 nc -p 8140 -z -v -n 10.X.X.9 9091 nc -p 8140 -z -v -n 10.X.X.9 9092 nc -p 8140 -z -v -n 10.X.X.9 9093 and so on ... After the 1st nc execution , for the remaining of all the lines I am getting below mentioned error message. nc: bind failed: Address already in use nc: bind failed: Address already in use nc: bind failed: Address already in use Is there any way of avoiding this situation? networking tcp netcat share|improve this question edited Dec 9 '14 at 14:48 Eric Leschinski 6991615 asked Mar 24 '14 at 21:27 saurav 1641211 add a comment| 2 Answers 2 active oldest votes up vote 7 down vote accepted Background When you're attempting to use nc in this manner it's continuing to keep the TCP port open, waiting for the destination to acknowledge the receiving of the done request. This is highlighted in the TCP article on Wikipedia. TIME-WAIT (either server or client) represents waiting for enough time to pass to be sure the remote TCP received the acknowledgment of its connection termination request. [According to RFC 793 a connection can stay in TIME-WAIT for a maximum of four minutes known as a MSL (maximum segment lifetime).] You can see the effects of this when I use nc similarly: $ nc -p 8140 -v -n 192.168.1.105 80 Looking at the state of port 8140: $ nets