Hello all ,
How can we allow a server to bind to a port that appears to be held open by a
client process? The netstat below indicates that port 9521 is not being
listened
to by any server process:
$netstat -an | grep 9521
tcp 0 0 127.0.0.1:9521 127.0.0.1:9521
ESTABLISHED
tcp 0 0 10.1.235.31:47776 10.1.19.219:9521
ESTABLISHED
We are using SO_REUSEADDR in the server code, which on Solaris always allowed
to re-bind to the port in question.
int on = 1;
if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) == -1)
printf("setsockopt SO_REUSEADDR failed: port=%d fd=%d", on, fd);
On Linux there appears to be a caveat with using SO_REUSEADDR in conjunction
with INADDR_ANY. This is from the Linux socket man page:
SO_REUSEADDR
Indicates that the rules used in validating addresses supplied
in a bind(2) call should allow reuse of local addresses. For
PF_INET sockets this means that a socket may bind, except when
there is an active listening socket bound to the address.
When the listening socket is bound to INADDR_ANY with a spe-
cific port then it is not possible to bind to this port for
any local address.
despite the fact that no server can bind the port, no new client can establish
a connection to the port.
Also, the client that is established to the port is sending messages to what
it believes is its peer.
No errors are returned.
The socket has been in this state for couple of a days
Please advise ,
Thanks for your time and inputs
Thanks
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