Networking :: Socket Timeout Happening Despite Data Being Available?

Dec 29, 2010

I am using select to read the data from socket. on a load of 25 req per second, for some req i am getting the timeout in select (returning zero), but i am able to see the data on TCP using wireshark. kindly suggest what could be the possible reasons.

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Networking :: Configuring Socket Timer To Release Socket Once The Connection Is Terminated?

Jun 4, 2010

I want to configure socket timer to release socket(port) once the connection is terminated. Do we have something in Linux OS to configure this delay to release socket?.

Any command, link or man-page anything will be helpful.

I browsed a lot but unable to find it.

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Networking :: /usr/sbin/in.telnetd: Getpeername: Socket Operation On Non-socket?

May 5, 2009

I had installed Fedora 10

Below is the output of uname -a

Linux #1 SMP Tue Nov 18 12:08:10 EST 2008 i686 i686 i386 GNU/Linux

I need to enable telnet service on it, then found xinetd and telnet-server not installed,

Then I had installed below
First I had installed Xinetd: xinetd-2.3.14-21.fc10.i386.rpm
then I had installed telnet-server: xinetd-2.3.14-21.fc10.i386.rpm

After installation I executed below commands

Service xinetd start
Chkconfig xinetd on
Chkconfig telnet on
Service iptables stop
Chkconfig iptables off
Iptables �F

After I had tried telnet localhost ----IT FAILED

when I run telnet server manually by issuing the below command
/usr/sbin/in.telnetd, I get below error
[COLOR="Red"]/usr/sbin/in.telnetd: getpeername: Socket operation on non-socket[/COLOR]

I have other system running same OS, I had followed the same steps discussed above to enable telnet, It works fine on it.

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Programming :: Read Data From A Socket?

Aug 24, 2010

I need to read data from a socket but it should be always listening because data arrives continuously .. I thought something like this would do it but it doesn't work .... I already set the socket options before

Code: char databuf[1024];
int datalen = sizeof(databuf);
if(read(sd, databuf, datalen) < 0)


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Networking :: Multiple FTP Upload Socket Error "Connection Reset By Peer: Socket Write"

Jan 31, 2010

I am pragmatically trying to upload a list of files from my client machine to a proFTPd server I have running on Ubuntu. Every time I get several (around fifty) files into the transfer, I get the following error: Quote: Connection reset by peer: socket write error

I am able to remotely upload 25,000 small files of ~ 1K in size, but when I go to upload hundreds of 2-4 Mb files, I get a socket write error. Am I using up all available sockets before they can be released? If so, how do I release the sockets? If not, what does this error mean and why am I getting it?

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Programming :: Receiving Wrong Data On Winsock From Unix Socket

Jan 28, 2011

currently I've got a big problem on programming with sockets. I use the winsock2 API and want to receive data from a multicast adress running on a UNIX-PC. The connection works fine and I really receive data from this group, but as it seems not the right packages. The received data is saved in a char[]. E.g. at received_msg[12] is a float value. This one I would like to read out, convert and use it in later progress the next value is y at received_msg[16]. The same Code works on a Unix PC with unix sockets but converted to winsock I've got the described problem and I have to make this code work under windows.

Here a piece of the code (received_msg[12]='3f'):

Buffer is a struct containing the two float values x and y. If I convert the char as this under windows the value of x is a huge number. The correct value is around 192, so receveid_message[12] should be 1.92. Could it be that the Unix-PC is sending data in an other way than the winsock receive it?

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Ubuntu Networking :: Wireless Drops Occassionally / Why This Is Happening?

Sep 2, 2010

I'm running 9.10 on a desktop that connects to my network using a PCMCIA wifi card plugged into a PCI cardbus adapter. Sometimes, (it seems to be when too much data has gone over the card), I lose connectivity. nm-applet still shows me connected but I can't even get to my router (ping or gui). I use ndiswrapper for the driver.

If I unplug the PCMCIA card and then plug it back in I get going again. My questions are:

1) Anyone have an idea why this might be happening?

2) Is there a way in software for me to unload and reload the wifi card?

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Ubuntu :: Set The Default Os To Boot As Windows 7 With A Timeout Of 1 Second - Reset The Timeout To 3 Seconds?

Aug 4, 2011

I set the default os to boot as windows 7 with a timeout of 1 second. I thought that this would be enough time to switch os ubuntu when i need to, but I am unable to. How can i reset the timeout to 3 seconds? I also cannot view the ubuntu partition within windows because of ubuntu's file system.

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Server :: Socket Connections / Socket And TCP Connection For Connecting To An External System?

Dec 7, 2010

Anyone knows the difference between a socket and TCP connection for connecting to an external system?

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General :: Socket Programming - Feed Some Words One By One To The Socket

Jul 6, 2010

i'm writing a simple program of client socket program. Here below is the code sample which i'm writing...

#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>

the above code works fine.if we copmile and run ./a.exe 1111 and press enter it works fine..everytime it asks "Please enter the message: " and if give that will be displayed in server. but my problem is i dont want to print everytime "Please enter the message: " i just want to feed some words one by one to the socket.

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Programming :: Setsockopt : Socket Operation On Non-socket Getting Error?

Mar 30, 2009

im getting that error in my code for some reason. I compiled my code, and when i try to run this server it throws me an error on my call to setsocketopt(). The only way it can reach that part of my loop is if it succeeds when it calls sock() so I dont understand why the error says its an operation on a non-socket. Im just trying to set up a server to pass messages from a client to it a viceversa. Here is the code:

int main()
int socket_fd, new_socket_fd, k;
struct addrinfo hints, *server_info, *p;
struct sockaddr_storage peer_address;

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General :: Socket Error / Socket 31: 0x36?

Sep 15, 2009

We are seeing recv err on socket 31: 0x36. What could be meaning of the error?.

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Networking :: How Long Before TCP Ack's Timeout

Oct 13, 2010

I'm trying to get granular with TCP, one of the answers I can't seem to find is. When a client server connection is lost without closing, how many duplicate ack's are sent until the session is closed. I've kind of figured out the the sender will continue to retransmit a segment for about 9 mins if not Ack'd. going from 1.5,3,6,12,24,48 and the continuing with 64 seconds up to around 9 minutes before is resets the session. but whats happening at the other end.?

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Networking :: Specify A Value For Forwarders Timeout?

Apr 26, 2011

I have a named server that has forwarders setup. Quite often the dns server where I forward would not respond right away and the query would fail. It would then also cache the empty result for 3 hours and I would need to restart the service or clear the cache. how would I be able to specify a value for forwarders timeout, just like on Windows DNS.

BIND 9.3.6-P1-RedHat-9.3.6-4.P1.el5_5.3

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Networking :: Timeout While Rsync ?

Nov 26, 2009

I was trying to rsync datas from one server to a remote server. There is a firewall between the two servers and the 22 port is open for the servers.

Attached the error that I got.

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CentOS 5 Networking :: How To Set Ssh Timeout

May 27, 2009

I have centos 5.3 server and the problem is the ssh timeout time set to 10 minutes of inactivity. I want to set the timeout to 1 hour, how can I set the timeout time?

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Networking :: BlackArmor NAS 110 Having Timeout Errors

May 17, 2010

My spouse bought me a Seagate BlackArmor NAS 110 recently, and I finally had time to connect it to our home network. I have samba installed, and my linux box (opensuse 11.1) can see the NAS, but when I try to open the network connection I get a "timeout on server" message. I bumped up the network connections, but still no luck. The odd thing is that last night I was able to connect and see the public folders for awhile. And her Windows Vista computer seems to connect without a problem after using the seagate software.

I'm no network admin, and have exhausted my resources on this.

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Networking :: Timeout In All Connections After A Period

Jan 11, 2011

I installed linux 2010 mandriva on a (embeded) system,and i run several server programs on it that accept connections from clients. clients are connected to server(s) and every things is ok, but when i go to home and back to my work tomorrow, i see no data can be sent to server programs and this problem exists until i restart the server programs or reconnect tcp client programs. this problem occurs even when both client and server programs executed on the same (embeded) system.why this happens? i checked by netstat and see that server ports exists in the list(and not closed by kernel) but it seems kernel or an application above it prohibit data transmission.i changed the OS and installed ubuntu but the problem exists.

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Networking :: Ssh Connection Timeout When Trying To Go Through Router

May 6, 2011

I am trying to set up an ssh server on my Debian squeeze box so that I can access it remotely when I'm not at home. I connect to the internet through an at&t 2wire modem/router. First off, I *can* ssh into the machine from inside the local network, e.g.


Nmap done: 1 IP address (1 host up) scanned in 2.12 seconds Playing around with Nmap, I also found that it only sees port 50001 as open.

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Ubuntu Networking :: Connection Timeout On Desktop

May 20, 2010

Something is wrong with the networking on this Ubuntu system. It has been assigned the LAN ip address From another Ubuntu desktop, I can: ssh myself@ ( from ) and I can login without any problems. I can ping ( from )


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Ubuntu Networking :: How To Troubleshoot Network Timeout

Jun 2, 2010

My local area network is always time out for few seconds.I have check my memory with "free -m"There are still left 200+ mb left.I am hosting my own ubuntu server, and I share the same internet line with my server and pc. when I access to LAN, I need to type, at outside I can access to [URL]It is only the LAN access timeout, but when I access at outside, I didn't face this problem at all.

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Ubuntu Networking :: Set The Wins Name Resolution Timeout?

Dec 18, 2010

I am experiencing horrible name resolution problems in Maverick. I believe this problem is related to having the following line in nsswitch.conf:hosts: files wins dnsI do use Samba and access windows shares in my network (that's why wins precedes dns. I was wondering if there is any way to setup a wins lookup timeout so it can fail quickly enough to try to perform the lookup using dns.

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Networking :: Snmp - Timeout: No Response From Localhost

May 17, 2010

I am facing issues on few machines but rest all are ok. They have the same config but I don't know what is wrong. I tried as much as I could but couldn't fix it. Here is the rpms installed on this client


The same config is working for all clients but have problems with few machines. May be I am doing something wrong in config or testing at very basic level.

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Networking :: MacOSX To RHEL5 / 6 Ssh Connection Timeout

Apr 1, 2011

I have a user using Mac OSX and ssh-ing to a couple of Redhat servers, one running RHEL5 and the other RHEL6. The user's connection seems to be timing out after 60 minutes or so of inactivity. The user is on the same subnet as the servers. Both servers have the same sshd_config files with the following entries with regards to timeout:

TCPKeepAlive yes
ClientAliveInterval 30
ClientAliveCountMax 99999

In a nutshell, his office Mac keeps getting dropped off both machines. Other machines, including the Mac he logs in with from home doesn't get timed out and keep the connection open. The log files are unremarkable and the switch port shows no errors

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Networking :: Serial Port : Read Data, Not Reading Complete Data?

Mar 5, 2010

I have an application where I am sending data via serial port from PC1 (Java App) and reading that data in PC2 (C++ App). The problem that I am facing is that my PC2 (C++ App) is not able to read complete data sent by PC1 i.e. from my PC1 I am sending 190 bytes but PC2 is able to read close to 140 bytes though I am trying to read in a loop.Below is code snippet of my C++ AppOpen the connection to serial port

serialfd = open( serialPortName.c_str(), O_RDWR | O_NOCTTY | O_NDELAY);
if (serialfd == -1)


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Networking :: TCP And UDP Socket On Same Port ?

Nov 20, 2009

Can we open TCP and UDP socket on same port number?

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Ubuntu Networking :: PPTP Connection Failing With LCP Timeout

Mar 6, 2010

I'm using Kubuntu 9.10, my pppd version is 2.4.5 and pptp is 1.7.2 I'm trying to connect to the iPredator VPN service, but I keep running into problems with LCP. I've tried using knetworkmanager, nm-applet, kvpnc and plain old text-based configuration to no avail. Here's a snippet of pppd's output:


(I've got "defaultroute" in my /etc/ppp/peers/ipred config file.) Any ideas what could be causing this? Could it even be my router? It claims to support PPTP, but considering it claims a lot of other things which aren't true, I wouldn't be surprised if it was the culprit.

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Ubuntu Networking :: OpenVPN (IP Config Get) Timeout Exceeded

May 16, 2010

I am using Witopia VPN services and used to work just fine on my Ubuntu 10.04. All of the sudden it stopped working. Here is the log:

May 17 00:56:58 saeed-laptop NetworkManager: <info> Starting VPN service 'org.freedesktop.NetworkManager.openvpn'...
May 17 00:56:58 saeed-laptop NetworkManager: <info> VPN service 'org.freedesktop.NetworkManager.openvpn' started (org.freedesktop.NetworkManager.openvpn), PID 11477
May 17 00:56:58 saeed-laptop NetworkManager: <info> VPN service 'org.freedesktop.NetworkManager.openvpn' just appeared, activating connections
May 17 00:56:58 saeed-laptop NetworkManager: <info> VPN plugin state changed: 1
May 17 00:56:58 saeed-laptop NetworkManager: <info> VPN plugin state changed: 3
May 17 00:56:58 saeed-laptop NetworkManager: <info> VPN connection 'VPN Connection' (Connect) reply received.
May 17 00:56:58 saeed-laptop nm-openvpn[11482]: OpenVPN 2.1.0 i486-pc-linux-gnu [SSL] [LZO2] [EPOLL] [PKCS11] [MH] [PF_INET6] [eurephia] built on Jan 26 2010
May 17 00:56:58 saeed-laptop nm-openvpn[11482]: WARNING: No server certificate verification method has been enabled. See [URL] for more info.
May 17 00:56:58 saeed-laptop nm-openvpn[11482]: NOTE: the current --script-security setting may allow this configuration to call user-defined scripts
May 17 00:56:58 saeed-laptop nm-openvpn[11482]: WARNING: file '/home/saeed/Documents/config/VPN_Connection.key' is group or others accessible
May 17 00:56:58 saeed-laptop nm-openvpn[11482]: /usr/bin/openssl-vulnkey -q -b 1024 -m <modulus omitted>
May 17 00:56:58 saeed-laptop nm-openvpn[11482]: LZO compression initialized
May 17 00:56:59 saeed-laptop nm-openvpn[11482]: RESOLVE: NOTE: (address omitted) resolves to 12 addresses, choosing one by random
May 17 00:56:59 saeed-laptop nm-openvpn[11482]: UDPv4 link local: [undef]
May 17 00:56:59 saeed-laptop nm-openvpn[11482]: UDPv4 link remote: [AF_INET]IP address omitted
May 17 00:57:39 saeed-laptop NetworkManager: <info> VPN connection 'VPN Connection' (IP Config Get) timeout exceeded.
May 17 00:57:39 saeed-laptop nm-openvpn[11482]: SIGTERM[hard,] received, process exiting
May 17 00:57:39 saeed-laptop NetworkManager: <info> Policy set 'Auto Belkin' (wlan0) as default for routing and DNS.
May 17 00:57:51 saeed-laptop NetworkManager: <debug> [1274043471.002409] ensure_killed(): waiting for vpn service pid 11477 to exit
May 17 00:57:51 saeed-laptop NetworkManager: <debug> [1274043471.002596] ensure_killed(): vpn service pid 11477 cleaned up

I removed IP addresses. I think its a recent update might have created this issue. I tried re-installing openvpn and network-manager-openvpn.

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Ubuntu Networking :: VPN PPTP - (IP Config Get) Timeout Exceeded

Jul 1, 2010

I'm trying to configure internet access using KDE network manager. Added new VPN connection, set gateway and other options but connection breaks. Here is /var/log/daemon.log

Jul 1 17:35:22 dvinokurov-desktop NetworkManager: <info> Starting VPN service 'org.freedesktop.NetworkManager.pptp'...
Jul 1 17:35:22 dvinokurov-desktop NetworkManager: <info> VPN service 'org.freedesktop.NetworkManager.pptp' started (org.freedesktop.NetworkManager.pptp), PID 1761
Jul 1 17:35:22 dvinokurov-desktop NetworkManager: <info> VPN service 'org.freedesktop.NetworkManager.pptp' just appeared, activating connections .....
log[ctrlp_rep:pptp_ctrl.c:251]: Sent control packet type is 12 'Call-Clear-Request'
Jul 1 17:36:02 dvinokurov-desktop pptp[1773]: nm-pptp-service-1761 log[call_callback:pptp_callmgr.c:79]: Closing connection (call state)

As I understand the main problem is in "(IP Config Get) timeout exceeded".

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CentOS 5 Networking :: Transactions Timeout - Yum / Wget And HTTP

Apr 28, 2011

I am having a problem with 5.4 that I did not have with 4.5. The problem happens only sometimes but in specific instances. Basically a summary of the problem is that certain network transactions timeout. The specific instances are with wget, rpm, http. The problem usually, but not always, occurs with pptp stuff. (NOT running pptp but getting pptp stuff). For instance, the following command, which finishes in seconds on non-5.4 OS's:
wget [URL]
downloads about 20% then gets stuck. About 5 minutes later it downloads another 20% and then gets stuck, etc. The same thing with rpm:
rpm -ivh [URL]
waits about 3 minutes and then gives an error. I think it does the same thing as the wget but
wget will keep trying, while rpm gives up. The error from rpm:
Retrieving [URL]
..five minutes later:

I can wget the above as I mentioned before and install it that way. Before I do it, yum works fine. Afterwards, yum exhibits the same behavior of timing out (because it is using the pptp repository). Also visiting the pptp web site from Firefox times out on certain pages. I originally thought it was some problem with the pptp site, but I notice that log into Does the same thin (fine on other operating systems). A view with Wireshark on the wget (pptp) shows the my machine receiving a reassembled TCPPDU from (Sourceforge), sending an ack, receiving a reassembled PDU, sending an ack, receiving, sending followed by the 5 minutes or whatever of nothing. Then sourceforge sends an RST and a SYN and the process is repeated.

When I put the machine directly on an AT&T IP connection (12.147.X.Y) everything worked fine. Same with Comcast on a direct link. The times I am having problems is when our router is hooked up to a Comcast IP (70.88.X.Y) and assigns 192.168.5.X addresses to our machines. So when I was doing the above from going through the router through Comcast is when I had the problem. So it is probably something with the router, but it is hard to figure out since CentOS 4.5 and Fedora do not exhibit this behavior, nor does 5.4 on most sites ( for instance). I did verify, at least from what I could, that ICMP type 3 and 4 are not being blocked. If they were, the same problem would happen on other op systems. And I was able to ping, albeit just locally, but we looked at the router settings and ping was not blocked.

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