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• Count of memory copies in *nix systems between packet at NIC and user application?

  - by Michael_73

  Hi there, This is just a general question relating to some high-performance computing I've been wondering about. A certain low-latency messaging vendor speaks in its supporting documentation about using raw sockets to transfer the data directly from the network device to the user application and in so doing it speaks about reducing the messaging latency even further than it does anyway (in other admittedly carefully thought-out design decisions). My question is therefore to those that grok the networking stacks on Unix or Unix-like systems. How much difference are they likely to be able to realise using this method? Feel free to answer in terms of memory copies, numbers of whales rescued or areas the size of Wales ;) Their messaging is UDP-based, as I understand it, so there's no problem with establishing TCP connections etc. Any other points of interest on this topic would be gratefully thought about! Best wishes, Mike

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• Sql server management studio reporting "The semaphore timeout period has expired."

  - by nis-simonsen

  On our development sql server, executing any query containing more than approximately 700 characters stalls for about 10 seconds and then reports the following error: Msg 121, Level 20, State 0, Line 0 A transport-level error has occurred when receiving results from the server. (provider: TCP Provider, error: 0 - The semaphore timeout period has expired.) for example, this query select * from FooTable where id = ' (.. and then 700 spaces ..) ' fails fails with the timeout error while this one select * from FooTable where id = ' (.. and then 600 spaces ..) ' fails with the expected Msg 8169, Level 16, State 2, Line 1 Conversion failed when converting from a character string to uniqueidentifier. - immediately. Indeed, throwing any query, including random garbage at our dev sql server exhibits this behaviour, while any other sql server I have available acts as expected, so I would think that the query never actually gets to parsing on the server. I'm at a loss here - any hints?

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• Troubleshooting occasional timeout of select() in windows

  - by JonF

  I'm having an occasional problem with select() timing out on me. I have it set for twenty seconds. The system will handle 100's of transactions correctly, but occasionally one fails with the selet timing out. It does about 1 transaction every few seconds, opening and closing the tcp conncetion with each transaction. I thought the server my app was connecting to might have to many connection attempts pending, but no 4226 events are showing up in the logs One more point thing I noticed when using wireshark that I'm getting a SYN,RST in response to the SYN I am appearently sending. This only happens a few times over the first second or two, then I don't see any more activity in Wireshark

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• How to difference sockaddr_in struct from same subnetwork and different IP/users

  - by user1428926

  I am developing a gaming server using the Winsock2 API from Windows, just for now until porting it to Linux. The main problem I have found is that I don't know how to differentiate gaming clients that come from the same router/network. Let´s imagine 2 gamers that are in the same network going to the Internet through the same router IP and port with, for example IP 220.100.100.100 and port 5000, how can my C/C++ server differentiate both TCP connections and know that they are two different gamers? Can I find any difference in the sockaddr_in struct that returns the socket when accept(...) returns ??

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• SQL server connection trouble in network but not in local

  - by user1517139

  for the first time that I would work with SQL SERVER 2005, the jdbc connection doesn't work in the network I searched and have done thousand of things that doesn't work, i also want to precise that i already had worked with other DBMS, so here is the problem: when i try to connect by jdbc from the machine where sql server is installed everything work just fine, but when i try from a different machine, the jdbc is unable to create the connection, i already checked that TCP/IP communication is enabled that the port (not dynamically assigned) is 1433 and i even tried with different ports, i also tried with the same driver and different driver, i checked that i was able to communicate with the http server (who is installed in the machine where SQL server is installed) and it works but that jdbc connection can't, i tried thousand of things until i forgot some of them, someone please help

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• Efficient multiple services exposed over c# .NET remoting using more channels or end points?

  - by wb

  I am using remoting over TCP for a prototype distributed server application where I want to have varying multiple services exposed from each remoting server process. In some cases I want the services running from the same process but I don't want whatever is using the service to care about that. I am wondering is it more efficient to have multiple services in the same process going over the same remoting channel distinguished by endpoint URI/URL or should I be creating new channels on different ports for each service in the same process? Using up ports isn't so much of a problem as the number of services will be low and the network and machine configuration is completely controlled. Also its not clear to me if remoting sends the URI string for every single message or just at connection time, and whether if the remoting framework is intelligent enough to reduce work if calls are made on the same machine and even the same process? Thanks in advance.

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• What library to use to create a simple port scanner?

  - by durje

  I need advise to create a simple port-scanner, who will need to detect if some specific devices are connected to the network from theire IP/MAC address. I am working on windows 7 and can use preferably C++ Builder 2010 Embarcadero, or java or Qt. The library have to be under a public domain or equivalent, as my software is a proprietary software. What library would you advice? Do you know any free software that I could start from, or any examples? What about using Indy Sockets or Synapse TCP/IP Librarys? Thanks in advance.

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• AS3 / Java - Socket Connection from live Flash to local java

  - by PitchBlackCat

  Hey guys, I'm trying to get a live flash that lives on a webserver to talk to a local java server, that will live on the clients PC. I'm trying to achieve this with a socket connection. (port 6000) Now, at first flash was able to connect, but it just sends <policy-file-request/>. After this nothing happens. Now, some people at Kirupa suggested to send an cross-domain-policy xml as soon as any connection is established from the java side. http://www.kirupa.com/forum/showthread.php?t=301625 However, my java server just throws the following: End Exception: java.net.SocketException: Software caused connection abort: recv failed I've already spend a great amount of time on this subject, and was wondering if anyone here knows what to do?

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• Intercommunication between Java Chat Servers

  - by Pravingate

  I have a application in which I am using socket programming , having this(image) scenario. Where number of clients will try to connect Broadcast server. Now here I am managing load through LVS(Load balancer). so as a example shown in image, suppose 200 clients will wish to login for broadcast they will be distributed as 100 users on server 1 and another 100 users on server 2.clients will get connected to servers using TCP connection. Now I am maintaining user information on server side in arraylist which will be stored in heap memory,Now the problem is if client wish to broadcast to all logged in users, but that particular client is logged in server 1. and so client will not be able to broadcast another 100 users from server 2. Because both ther servers are unaware about each others state. please suggest to solve this scenario by whatever means you want.

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• Creation obex connection without service discovery

  - by Vio

  Hello there my problem is this,i want to create an obex connection but i already know my server adress.The problem is how to get the connection url without service discovery.I use a normal java project for my server side and a midlet project for my client side.I will post the code maybe it helps. Server connection UUID uuid=new UUID("8841",true); String url="btgoep://localhost:"+uuid+";name=FTP;authenticate=false;master=false;encrypt=false"; SessionNotifier sn=(SessionNotifier)Connector.open(url); System.out.println("Now waiting for a client to connect"); sn.acceptAndOpen(this); System.out.println("A client is now connected"); When i try to connect with the client it doesn't get to the last line :(....any ideas why?Hope u can help...thanks

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• MySQL does not work on localhost without Local Area Connection

  - by user985171

  I use WampServer(Apache, PHP, MySQL) and have no problems when some kind of network adapter(wireless or lan) is connected(i-e Local Area Connection has status connected) 'even if i am not connected to the internet'(for example when i am connected to the router but that is not connected to the internet). When there is no network connection, i get a php error like MySQL could not connect to 127.0.0.1 on port 3306. Interestingly, 'telnet 127.0.0.1 3306' says that it could not connect to the port, even when the server and MySQL are running fine(i-e when some kind of local area connection is connected). So i turned off all kinds of firewall(antivirus and windows) but still no difference in anything. And that is why this issue is quite puzzling. Things i have already tried(will update this list along the way):- -The skip-networking directive in my.ini.

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• How to manually close connection in BaseHTTPServer?

  - by user1657188

  I have a script that sends a request to an HTTP server. HTTP server script (snippet): ... class MyHandler(BaseHTTPServer.BaseHTTPRequestHandler): def do_GET(sa): pdict = cgi.parse_header(sa.headers.getheader('referer')) q = pdict[0] q = urllib.unquote(q) if q == "enternetixplorer" # basically just ignore this, doesn't have to do with the question sa.wfile.write("blah blah blah") # now restart server httpd.server_close() python = sys.executable os.execl(python, python, * sys.argv) ... The "blah blah blah" is sent back, but the connection does not seem to close, and my script is waiting forever until I abort the server. (My thought is BaseHTTPServer automatically closes connection when the last part in "do_GET()" is computed, but I prevent this by restarting the script.) If I'm right, how do I close the connection? If not, what else might be the problem? Edit: The server script HAS to restart the entire program.

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• 16 millisecond quantization when sending/receivingtcp packets

  - by MKZ

  Hi, I have a C++ application running on windows xp 32 system sending and receiving short tcp/ip packets. Measuring (accurately) the arrival time I see a quantization of the arrival time to 16 millisecond time units. (Meaning all packets arriving are at (16 )xN milliseconds separated from each other) To avoid packet aggregation I tried to disable the NAGLE algorithm by setting the IPPROTO_TCP option to TCP_NODELAY in the socket variables but it did not help I suspect that the problem is related to the windows schedular which also have a 16 millisecond clock.. Any idea of a solution to this problem ? Thanks

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• Blackberry wifi connection issue

  - by AmitG

  Hi all, I have a very strange issue with my blackberry application. My application first searches for a blackberry network ( ;interface=wifi , ;deviceside=true , ;deviceside=false" + ";ConnectionUID="+ myRecord.getUid() ) transport and after finding one, it uses it to connect the server application. The issue is that some of my web services consumed by the bb client applicaton does not work when the connection type is wifi. Example: I have a series of web services called one after the other, login , x , y ,z, and logout. The connection transport selected = WIFI Login and LogOfff works fine but x, y and z web services return me an error message. The same series of web services ( Login, x,y,z, Log Out,) works with other connection transports ( eg. ap2trans) . Please help me with this issue as connecting to wifi ( if available ) is important for the application. Pleaes provide even the smallest info in this regad. thanks in advance

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• how to remove security settings from a connection string in vb.net

  - by teju

  hi i am trying to add data to the database that was created by some one but when am trying to insert or delete or update the exception is raising and entire project is not working properly and the error i am facing is "A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: SQL Network Interfaces, error: 26 - Error Locating Server/Instance Specified)" so now what should i do to resolve this error and my connection string is written as Dim CON As New SqlConnection("Integrated Security=SSPI; Persist Security Info=False;Initial Catalog=DIGITALGAMES; Data Source=TEJUS-PC\SQLEXPRESS") is there any problem with my connection string ??

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• Delphi and mysql - Unable to connent to server..maybe custom connection reqd

  - by Steve

  I am coding an application for my company wherein i want to parse the results of a mysql query and display them in my application but i am facing a problem conecting to the database. the ip address of the server is : 172.30.192.20 and before i can ping it i have to add route on my pc something like this route add 172.30.192.0 mask 255.255.255.0 172.30.192.56 where 172.30.192.56 is the gateway Now whenever i try to connect 172.30.192.20 which is where the sql server is running my appplication instead connects to 172.30.192.56 i am coding the application in delphi and have used TmySQL After this didnt workout i tried an application called SQLwave. I just entered the server ip address and was able to connect to the database without any problems. it seems sqlwave uses mydac which is why even i tried using it but using the default connection options and setting i was still not able to connect. it seems sqlwave uses a custom connection using mydac i just want to know whats going wrong with my connection

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• How to turn one server into many servers? (Virtualization/VMWare)

  - by user1229962

  I'm hoping for a high level discussion of this problem I know is quickly approaching my application. I have a server that binds on a specific port and manages TCP Sockets from my clients. I know that it is common practice to use VMWare to virtualize servers and run multiple servers at once. How can a single server design be changed to support multiple servers? Multiple servers can't bind to the same port. If I had to guess I would say a proxy server binds to the port and then sends connections off to the other servers to be handled as if it was still a single server application. I'm wondering what options there are and what are the common practices for solving this problem? Thanks in advance!

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• Forking with a listening socket

  - by viraptor

  I'd like to make sure about the correctness of the way I try to use accept() on a socket. I know that in Linux it's safe to listen() on a socket, fork() N children and then recv() the packets in all of them without any synchronisation from the user side (the packets get more or less load-balanced between the children). But that's UDP. Does the same property hold for TCP and listen(), fork(), accept()? Can I just assume that it's ok to accept on a shared socket created by the parent, even when other children do the same? Is POSIX, BSD sockets or any other standard defining it somewhere?

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• API server not function ["The connection has been reset"]

  - by Miguel Beltrán

  I'm having some troubles with one of my servers. I've done an application with two servers, one the frontend that grabs the data of server API (Ubuntu server). Well, yesterday had a lot of visits and the API server stop functioning but: -I can do stuff in MySQL by SSH. -The memory usage is ok. -The logs are ok. -The bandwitch usage is ok. -If i restart the server or Apache2, function by some time (3-4 minutes). And the most important i think if i tries to access to API (Is rest-style with http) it puts me the Firefox error "The connection has been reset". I'd tried: -Restart the server -Restart Apache2 -Restart MySQL -Viewed the logs of Apache2/MySQL I don't know too much about systems so i don't know what to do more.

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• Dual NIC Networking CentOS 5.3 (losing connection)

  - by Toymakerii

  I have a CentOS System with two NICs on it. One is Ethernet the other is Wireless. The Ethernet has an address of 192.168.1.110 and is tied to a LAN. (The LAN provides DHCP and DNS for its domain of 192.168.1.*) The Wireless card should have an address of 131.238.. and is tied to the WAN. For some evil reason, I can get the WAN to work for a short amount of time then it suddenly dies. I have to turn on/off the connection to get it to work again. Any suggestions?

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• Sonicwall SSL VPN: Unable to reconnect once connection drops

  - by Jeffrey Hantin

  One of my users is having problems with his NetExtender connection. After installing NetExtender from the portal, it connects fine -- ONCE. After that, attempting to reconnect gives Verifying user...authentication fail! and the log on the router shows: [timestamp] | Info | SSLVPN | Auth Failed: No user name in http request (message id: 1079) This seems odd to me because the user name, password and domain are entered on the NetExtender client. After this error occurs, the only way to connect again is to uninstall, reboot, and reinstall NetExtender. He can connect fine to the Sonicwall SSLVPN demo site, and a different user can connect fine to this site from a different PC. Any clues?

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• Dell Inspiron 1520 Intermittent connection to wireless router

  - by ChuckNevol

  I have two computers in my home which are connected to a wireless router and a wireless printer. One computer is a Del XPS and the other a Dell laptop Inspiron 1520. In recent weeks we noticed the Inspiron had difficulty maintaining connection to the wireless router - web pages would suddenly have to be reloaded, or the computer rebooted while the other computer, the XPS, had no problems on the same network. So we connected a hard wire line from the Inspiron to the Verizon supplied wireless router. Problems still exist. could it be a bad driver?

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• Connection lost to iscsi san after problem with san

  - by marceldejager

  Hi there, We have a cluster running with 3 VSpere ESX4 server that all are connected to a lefthand san through iSCSI. This all worked well but a week ago there was a problem with the san. After fixing that problem the VMWARE server continued working but this weekend I saw that 1 server didn't have a connection with the SAN. The other two work perfecly. I looked at all setting and I cannot find a problem. Nowhere I can't find any erros. Has anybode a idea? Thanks, Marcel

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• Cyrus IMAP: Unable to connect to remote host: Connection refused

  - by Nick

  I'm working on setting up a Cyrus 2.2 IMAP server on Ubuntu Server 9.04. If I telnet from the server itself: # telnet localhost imap I get: * OK IMAP Cyrus IMAP4 v2.2.13-Debian-2.2.13-14ubuntu3 server ready Which is what I should be seeing. If I try from another machine on the network: telnet 192.168.5.122 imap I get: telnet: Unable to connect to remote host: Connection refused UPDATE: From /etc/cyrus.conf # add or remove based on preferences imap cmd="imapd -U 30" listen="imap" prefork=0 maxchild=100 imaps cmd="imapd -s -U 30" listen="imaps" prefork=0 maxchild=100 #pop3 cmd="pop3d -U 30" listen="pop3" prefork=0 maxchild=50 #pop3s cmd="pop3d -s -U 30" listen="pop3s" prefork=0 maxchild=50 #nntp cmd="nntpd -U 30" listen="nntp" prefork=0 maxchild=100 #nntps cmd="nntpd -s -U 30" listen="nntps" prefork=0 maxchild=100 To the best of my knowledge, there is no firewall running on the box. I've tried restarting the saslauthd and cyrus2.2 daemons, with no effect. What else can I try?

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• Pidgin getting "Connection Refused" whenever I connect to IRC server

  - by tvanover

  On my win 7 x64 machine using pidgin 2.6.3 I cannot connect to any IRC server. I have tried most of the North American servers, as well as my workplace's internal server with no luck. I have tried from work as well as from home but different networks have no effect. I keep getting Unable to Connect: Connection refused. It work fine 3 weeks ago on this very machine running Win 7 x64. But then I re-imaged, and did not backup my .purple folder. Which I had used for the past 2 years and originally created on a vista install. I can connect using this install of Pigin to yahoo and msn with no problems. Just not to irc. Any thoughts?

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