Error In Tcp Non-blocking Connect 111 - Connection Refused
1 Topic closed #1 2011-05-17 07:29 PM simon Guest Connecting to/accepting from a non-blocking socket Hello,assume the following situation: I have a server application which accepts connections from (momentarily assuming) a single client. This is what I'm doing on the server side:1) Setup a listening socket (create socket, set it to non-blocking, bind() it to a port and then listen() on it).2) In a while loop, I check the listening socket for a connect() call by using select() and check if the listening socket can be read from. My timeval struct is currently set to zero (so select() instantly returns). If the set returned by select contains the listening socket, I call accept().On the client side, I'm doing the following (found in your FAQ: http://developerweb.net/viewtopic.php?id=3196):1) Set up a socket with the information of the server.2) In a while loop, I try to connect() to the server. If the return value is -1 (connection not successful), I proceed as described in the FAQ: put the socket in a set, call select() with a time-out on that set checking if the socket can be written to. If the time-out expires, I got to the beginning of the loop again, if not I check if the connection was successful or an error occurred.My questions:1) Generally: How is a successful connection established using non-blocking sockets? Is the approach described in the FAQ the only possibility? My initial thought (I'm new to socket programming...) had the client just call connect() in a while loop and I assumed this would show up when calling select() on the server side and at some point connect() would return successfully. What happens if you call connect() again before the server could accept() your previous connect()? Is it even possible that connect() returns successfully when connecting to a non-blocki
Today's Posts Advanced Search Find the answer to your Linux question: Entire Site Articles Downloads Forums Linux Hosting Forum GNU Linux Zone Networking connection refused error 111 in TCP client server If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below. ** If you are logged in, most ads will not be displayed. ** Linuxforums now supports the Tapatalk app for your mobile device. Results 1 to 2 of 2 Thread: connection refused error 111 in TCP client server Thread Tools Show Printable Version http://developerweb.net/viewtopic.php?id=7246 Email this Page… Subscribe to this Thread… Display Linear Mode Switch to Hybrid Mode Switch to Threaded Mode Enjoy an ad free experience by logging in. Not a member yet? Register. 08-24-2010 #1 Kiransing View Profile View Forum Posts Private Message View Articles Just Joined! Join Date Aug 2009 Location Bangalore ,India Posts 5 connection refused error 111 in TCP client server Hi I am facing connection refused error 111 in TCP client server program, in android native code which in C http://www.linuxforums.org/forum/networking/168601-connection-refused-error-111-tcp-client-server.html , but if code is in JAVA it works fine, but i want to continue in C only, in manifest file i have given permission and ip, port is correct . What am doing wrong?? or is their any network setting?? am using UBUNTU 10.04 and If both client server Linux pc it works fine. only if android emulator becomes client then am getting connection refused. pls help. Reply With Quote 08-27-2010 #2 Rubberman View Profile View Forum Posts Private Message View Articles Linux Guru Join Date Apr 2009 Location I can be found either 40 miles west of Chicago, in Chicago, or in a galaxy far, far away. Posts 13,260 There can be a lot of reasons for a connection being refused, including an incorrect host and/or port. In fact, that should be the only reason this is happening to get ECONNREFUSED (error 111), that no-one is listening on the port in question. So, provide the successful Java code, and the corresponding failing C code. At this point, nothing is certain. Sometimes, real fast is almost as good as real time. Just remember, Semper Gumbi - always be flexible! Reply With Quote Quick Navigation Networking Top Site Areas Settings Private Messages Subscriptions Who's Online Search Forums Forums Home Forums Linux Forums Linux Forums Site News / Info Your Distro Arch Linux Debian Linux Gentoo Linux Knoppix Linux Mandriva Linux Mint Linux PCLinuxOS Slackware Linux SuSE Linux Red Hat / Fedora Li
here for a quick overview of the site Help Center Detailed answers to any questions http://stackoverflow.com/questions/16130786/why-am-i-getting-the-error-connection-refused-in-python-sockets 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 http://www.on-time.com/rtos-32-docs/rtip-32/reference-manual/error-codes.htm developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is error in a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up Why am I getting the error “connection refused” in Python? (Sockets) up vote 28 down vote favorite 9 I'm new to Sockets, please excuse my complete lack of understanding. I have a error in tcp server script(server.py): #!/usr/bin/python import socket #import the socket module s = socket.socket() #Create a socket object host = socket.gethostname() #Get the local machine name port = 12397 # Reserve a port for your service s.bind((host,port)) #Bind to the port s.listen(5) #Wait for the client connection while True: c,addr = s.accept() #Establish a connection with the client print "Got connection from", addr c.send("Thank you for connecting!") c.close() and client script (client.py): #!/usr/bin/python import socket #import socket module s = socket.socket() #create a socket object host = '192.168.1.94' #Host i.p port = 12397 #Reserve a port for your service s.connect((host,port)) print s.recv(1024) s.close I go to my desktop terminal and start the script by typing: python server.py after which, I go to my laptop terminal and start the client script: python client.py but I get the following error: File "client.py", line 9, in s.connect((host,port)) File "/usr/lib/python2.7/socket.py", line 224, in meth return getattr(self._sock,name)(*args) socket.error: [Errno 111] Connection refused I've tried
Server FTP Client FTP Server TFTP Client TFTP Server Telnet Client Telnet Server Web Server SNMP Client POP3 Client SMTP Client SNTP Client SMB Server SMB Client WLAN Driver Error Codes RTPEG-32 RTUSB-32 Previous Next Error Codes The ERRNO values below are set when API calls fail. Use xn_getlasterror to retrieve the error code after an API call fails. Function xn_geterror_string) can be used to retrieve the string name of a particular error code. All errno values are defined in header file Rtipapi.h. EADDRINUSE (100)Another socket is already bound to the address specified in bind. Make sure closesocket or xn_abort was called on the other socket bound to the same address. Note that closesocket can take a few minutes to release the socket. You can use socket option SO_REUSEADDR (see setsockopt) to avoid this error. EADDRNOTAVAIL (101)Endpoint address not available. This error occurs when a match for the requested address is not found in the routing table. Entries are added to the routing table by xn_set_ip and xn_rt_add. EAFNOSUPPORT (102)Family not supported. This error occurs when the parameter family is not AF_INET for calls to socket. EARPFULL (104)ARP table full. This error is reported by send when the ARP cache is full. If this error occurs, increase CFG_ARPCLEN. EBADBAUD (105)Invalid baud rate. This error occurs when an invalid baud rate is passed to xn_attach. EBADCOMMNUM (106)Invalid COM port number. This error occurs when an invalid COM port is passed to xn_attach. COM port numbers start at 1 for COM1. ECONNREFUSED (107)Connection refused. This error can occur during an attempt to connect a TCP socket. It is reported when a reset or an unexpected SYNC message is received. EBADIFACE (108)Invalid interface number. This error occurs when an invalid interface number is passed to an API routine. EBADMASK (109)Invalid mask. This error is detected if an invalid mask (all FFs) is passed to xn_interface_open for an Ethernet interface. EBADRESP (110)Invalid ping response. This error occurs during xn_ping if an invalid response to a ping request is received. An invalid response is detected if the sequence number or the source IP address in the response is incorrect. EBADDEVICE (111)Invalid device type. This error occurs when a bad device type, minor number is passed to xn_interface_open or xn_attach. There must be an entry in the Device Table which matches the device type, minor number passed to xn_interface_open or xn_attach. EINPROGRESS (112)Socket is non-blocking but connect would block. A connect