localhost udp bind: address in use

Christopher K. Johnson ckjohnson at gwi.net
Tue Nov 1 02:25:20 UTC 2011

Is ipv6 enabled?

Any chance it is binding to loopback using an ipv6 loopback address, and 
then finding it is already bound using the ipv4 equivalent?

On 10/31/2011 09:20 PM, Michael D. Berger wrote:
> I have some complex multi-thread C++ code in which I do
> some internal signaling with udp sockets:
> snd:
> rcv:
> On my new F15_64 box, I usually get:
> errno=98=Address already in use
> in response to the bind command when I bring up the snd
> socket (which is first up) even when I just come up from
> power off.
> Rarely, it works. I have no idea why.
> If I ignore the 98 error, I get a write error on the socket.
> Even when it fails,
> netstat -uap
> shows the socket, which is not a surprise, and it
> is not there when the program is not up.
> Now on my old CentOS 5_32 box, the same code
> (but, of course, compiled for 32) works with no
> problem. I can start and stop it rapidly with no
> problem.
> Thanks for your suggestions.
> Mike.
> --
> Michael D. Berger
> m.d.berger at ieee.org
> http://www.rosemike.net/

"A society grows great when old men plant trees whose shade they know they shall never sit in" - Greek Proverb

More information about the users mailing list