Error Failed Binding To Socket Address Already In Use
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Could Not Bind Socket Address Already In Use
but the port number is shown free by `netstat` up vote 30 down vote favorite 8 I tried to bind my socket(server socket) at port number 8000. It worked and did the job for me. At the end of the code I close the socket as well. The very next instant I run my code again and it shows me that the address is already in use. I have could not bind ipv4 socket address already in use printed the meaning of error values strerror(errno); to see if my code working properly at each point. To check if the port is free I checked it using netstat but it shows that port number 8000 is free. It has happened with me a lot of times. Every time I then wait for a few more secs and then it starts working again. I am using c language. So what is he reason for this behavior by my OS. After a few more secs I run the code and then it works. anirudh@anirudh-Aspire-5920:~/Desktop/testing$ sudo ./a.out Socket Creation: Success File open: Success Socket Bind: Address already in use Socket Listen: Address already in use ^C anirudh@anirudh-Aspire-5920:~/Desktop/testing$ sudo netstat -lntp Active Internet connections (only servers) Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name tcp 0 0 0.0.0.0:80 0.0.0.0:* LISTEN 1348/lighttpd tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN 984/sshd tcp 0 0 127.0.0.1:631 0.0.0.0:* LISTEN 1131/cupsd tcp 0 0 0.0.0.0:3306 0.0.0.0:* LISTEN 1211/mysqld tcp6 0 0 :::22 :::* LISTEN 984/sshd tcp6 0 0 ::1:631 :::* LISTEN 1131/cupsd anirudh@anirudh-Aspire-5920:~/Desktop/testing$ sudo ./a.out Socket Creation: Success File open: Success Socket Bind: Address already in use Socket Listen: Address already in use ^C anirudh@anirudh-Aspire-5920:~/Desktop/testing$ c linux sockets share|improve
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Socket Error Address Already In Use Python
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Socket Address Already In Use Java
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 http://stackoverflow.com/questions/5106674/error-address-already-in-use-while-binding-socket-with-address-but-the-port-num 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 http://unix.stackexchange.com/questions/121230/nc-bind-failed-address-already-in-use 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: $ netstat -anpt | grep 8140 tcp 0 0 192.168.1.3:8140 192.168.1.105:80 TIME_WAIT - In fact on most Linux systems this TIME_WAIT is set to 60 seconds. $ cat /proc/sys/net/ipv4/tcp_fin_timeout 60 If you want to see the effect yourself you can use this snippet to watch when the port becomes released. $ date; nc -p 8140 -v -n 192.168.1.105 80 -w 1; date; \ while netstat -anpt | grep 8140; do date; sleep 10; done; d
] [ thread http://lists.freeradius.org/pipermail/freeradius-users/2010-February/044947.html ] [ subject ] [ author ] i would like to listen to the address assigned to the computer. 192.168.1.12 FreeRADIUS Version 2.1.0 g at lisa:/sbin$ sudo freeradius -X FreeRADIUS Version 2.1.0, for host i486-pc-linux-gnu, built on Sep 17 2009 address already at 17:22:02 Copyright (C) 1999-2008 The FreeRADIUS server project and contributors. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. You may redistribute copies of FreeRADIUS under the terms of the GNU General Public License v2. address already in Starting - reading configuration files ... including configuration file /etc/freeradius/radiusd.conf including configuration file /etc/freeradius/proxy.conf including configuration file /etc/freeradius/clients.conf including files in directory /etc/freeradius/modules/ including configuration file /etc/freeradius/modules/mac2ip including configuration file /etc/freeradius/modules/acct_unique including configuration file /etc/freeradius/modules/files including configuration file /etc/freeradius/modules/passwd including configuration file /etc/freeradius/modules/inner-eap including configuration file /etc/freeradius/modules/attr_filter including configuration file /etc/freeradius/modules/etc_group including configuration file /etc/freeradius/modules/detail.log including configuration file /etc/freeradius/modules/checkval including configuration file /etc/freeradius/modules/echo including configuration file /etc/freeradius/modules/smbpasswd including configuration file /etc/freeradius/modules/digest including configuration file /etc/freeradius/modules/krb5 including configuration file /etc/freeradius/modules/sradutmp including configuration file /etc/freeradius/modules/ippool including configuration file /etc/freeradius/modules/detail.example.com including configuration file /etc/freeradius/modules/detail including configuration file /etc/freeradius/modules/ldap including configuration file /etc/freeradius/modules/radutmp including configuration file /etc/freeradius/modules/always including configuration file /etc/freeradius/modules/preprocess including configuration file /etc/freeradius/modules/attr_rewrite including configuration file /etc/freeradius/modules/wimax including configuration file /etc/freeradius/modules