Error Connecting Connection Refused Socket Linux
Contents |
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 socket programming connection refused developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question
Unix Socket Connection Refused
x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; socket connection refused linux it only takes a minute: Sign up C, Sockets: Connection Refused error up vote 4 down vote favorite 1 I've a data acquisition module from which I would like to collect data from the Ethernet port. I'm getting there socket connection refused python in steps, currently I would like to just connect to server from a client. I've used Beej's guide to get the basic C code. But I just keep getting this connect error connect: Connection refused. This is what I do: The network IP mentioned here is STATIC IP which I have configured. The port number is set to 50000 on Server side and from the client side I connect to this IP on the port 50000. I build and run
Connection Refused Error In Socket Programming Java
the server side application and then try to connect to it by running a client side application. One doubt about server side, server side application returns before I start the client side application, so should I keep it running (while(1);) so that I can connect to it from the client side? What's going wrong am I forgetting something here? Help! I'm pasting the very slightly modified (IP and port numbers are different) Beej's C code for Server side and Client side here: Server.c /* ** server.c */ #include
here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta connection refused error in socket programming c Discuss the workings and policies of this site About Us Learn tcp connection refused more about Stack Overflow the company Business Learn more about hiring developers or posting ads with us
Socket: Connection Refused Connect:errno=111
Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, http://stackoverflow.com/questions/11497716/c-sockets-connection-refused-error helping each other. Join them; it only takes a minute: Sign up Socket error: connection refused - what am I doing wrong? up vote 9 down vote favorite I've just started learning the basics of sockets (Linux). I tried my hand at a small example, but it doesn't work and I have no idea what's wrong. I http://stackoverflow.com/questions/14344694/socket-error-connection-refused-what-am-i-doing-wrong get a "Connection Refused" error message. Here's my code: #include
and sever programs. But https://www.softlab.ntua.gr/facilities/documentation/unix/unix-socket-faq/unix-socket-faq-3.html when I run it, server is ok. But client showed that connection refused error. Why is it so? My client code is 1 address, or a host.domain.com style address. What I do with these, is first try to use it as a aaa.bbb.ccc.ddd type address, and if that fails, then do a name lookup on it. Here is an example:
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
#include
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
#include /* Converts ascii text to in_addr struct. NULL is returned if the address can not be found. */ struct in_addr *atoaddr(char *address) { struct hostent *host; static struct in_addr saddr; /* First try it as aaa.bbb.ccc.ddd. */ saddr.s_addr = inet_addr(address); if (saddr.s_addr != -1) { return &saddr; } host = gethostbyname(address); if (host != NULL) { return (struct in_addr *) *host->h_addr_list; } return NULL; }
3.2 How can my client work through a firewall/proxy server? If you are running through separate proxies for each service, you shouldn't need to do anything. If you are working through sockd, you will need to "socksify" your application. Details for doing this can be found in the package itself, which is available at: ftp://ftp.net.com/socks.cstc/socks.cstc.4.2.tar.gz you can get the socks faq at: ftp://coast.cs.purdue.edu/pub/tools/unix/socks/FAQ 3.3 Why does connect() succeed even before my server did an accept()? From Andrew Gierth ( andrewg@microlise.co.uk): Once you have done a listen() call on your socket, the kernel is primed to accept connections on it. The usual UNIX implementation of this works by immediately completing the SYN handshake for any incoming valid SYN segments (connection attempts), creating the socket for the new connection, and keeping this new socket on an internal queue ready for the accept() call. So the socket is fully open before the accept is done. The other factor in this is the 'backlog' parameter for listen(); that defines how many of these completed connections can be queued at one time. If the specified number is exceeded, then new incoming connects are simply ignored (which causes them to be retried). 3.4 Why do I sometimes loose a server's address when using more than one server? From Andrew Gierth ( andrewg@microlise.co.uk): Take