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• enabling tomcat web apps to be served from Ubuntu lucid

  - by user558925

  Hi, I have tomcat running on 8080 on a ubuntu lucid server. I am able to access it fro local machine. However I am unable to access the tomcat from any machine outside. Is it due to firewall restrictions. WHat do I need to do to enable accessing tomcat from remote machines. Tried adding this rule to iptables but it did not solve iptables --table nat --append PREROUTING --protocol tcp --destination-port 80 \ --in-interface eth0 --jump REDIRECT --to-port 8080 Any help would be appreciated Thanks Bala Thiruppanambakkam

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• Executing functions parallelly in PHP

  - by binaryLV

  Hi! Can PHP call a function and don't wait for it to return? So something like this: function callback($pause, $arg) { sleep($pause); echo $arg, "\n"; } header('Content-Type: text/plain'); fast_call_user_func_array('callback', array(3, 'three')); fast_call_user_func_array('callback', array(2, 'two')); fast_call_user_func_array('callback', array(1, 'one')); would output one (after 1 second) two (after 2 seconds) three (after 3 seconds) rather than three (after 3 seconds) two (after 3 + 2 = 5 seconds) one (after 3 + 2 + 1 = 6 seconds) Main script is intended to be run as a permanent process (TCP server). callback() function would receive data from client, execute external PHP script and then do something based on other arguments that are passed to callback(). The problem is that main script must not wait for external PHP script to finish. Result of external script is important, so exec('php -f file.php &') is not an option.

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• Database Engine not appearing in SQL Server listing

  - by Jonn

  I don't know if I'm searching for the wrong queries in google but I can't seem to find an answer to this. I have SQL Server 2008 installed in my pc and according to services.msc, I've got 2 database engines running: SQLEXPRESS (probably one that came along with Visual Studio) and MSSQLSERVER. When I try to connect only SQLEXPRESS is visible in the Server Name drop down list. I tried to explicitly state MSSQLSERVER by typing in MYPCNAME\MSSQLSERVER Didn't work. The best solution I could find in the internet was to enable stuff at Configuration Manager. Didn't work either (although I did find that TCP/VIA and all other options were disabled for MSSQLSERVER). Anyone have any other ideas on what I should try next or probably something that I overlooked?

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• Query to update rowNum

  - by BrokeMyLegBiking

  Can anyone help me write this query more efficiently? I have a table that captures TCP traffic, and I'd like to update a column called RowNumForFlow which is simly the sequential number of the IP packet in that flow. The code below works fine, but it is slow. declare @FlowID int declare @LastRowNumInFlow int declare @counter1 int set @counter1 = 0 while (@counter1 < 1) BEGIN set @counter1 = @counter1 + 1 -- 1) select top 1 @FlowID = t.FlowID from Traffic t where t.RowNumInFlow is null if (@FlowID is null) break -- 2) set @LastRowNumInFlow = null select top 1 @LastRowNumInFlow = RowNumInFlow from Traffic where FlowID=@FlowID and RowNumInFlow is not null order by ID desc if @LastRowNumInFlow is null set @LastRowNumInFlow = 1 else set @LastRowNumInFlow = @LastRowNumInFlow + 1 update Traffic set RowNumInFlow = @LastRowNumInFlow where ID = (select top 1 ID from Traffic where flowid = @FlowID and RowNumInFlow is null) END Example table values after query has run: ID FlowID RowNumInFlow 448923 44 1 448924 44 2 448988 44 3 448989 44 4 448990 44 5 448991 44 6 448992 44 7 448993 44 8 448995 44 9 448996 44 10 449065 44 11 449063 45 1 449170 45 2 449171 45 3 449172 45 4 449187 45 5

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• StreamWriter does throw exception underlying connection is broken?

  - by Jane

  I am using StreamWriter instantiated over a Tcpstream like this streamWriter = new StreamWriter(tcpClient.GetStream()); I am confused about the behaviour of following calls with regards to Exceptions. The following two functions are expected to raise IOException , Surprisingly they do not raise the IOException when the server is to which the tcpClient is connected is disconnected and therefore the underlying TCP client connection is broken.. These two lines execute without raising any Exception. Why ? streamWriter.WriteLine(strBuffer); streamWriter.Flush();

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• boost.asio's socket's recieve/send functions are bad?

  - by the_drow

  Data may be read from or written to a connected TCP socket using the receive(), async_receive(), send() or async_send() member functions. However, as these could result in short writes or reads, an application will typically use the following operations instead: read(), async_read(), write() and async_write(). I don't really understand that remark as read(), async_read(), write() and async_write() can also end up in short writes or reads, right? Why are those functions not the same? Should I use them at all? Can someone clarify that remark for me?

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• Grails external Jms broker (active mq)

  - by TheBigS

  I have what will become an 'external' activemq server I'd like grails to be able to talk to. Right now I am just running it on my dev box. Here is what I have setup right now: 1) Run activemq server 2) Run activemq/examples using ant to produce messages 3) View ActiveMQ admin site: http://localhost:8161/admin/queues.jsp verify that messages are in the queue. 4) Follow Mini Tutorial to create the Service and Controller: http://www.grails.org/ActiveMQ+Plugin 5) Configured my Grails resources.groovy file as follows: beans = { jmsConnectionFactory(SingleConnectionFactory){ targetConnectionFactory = { ActiveMQConnectionFactory cf -> brokerURL = 'tcp://localhost:61616' } } } When I run the grails app I get a BindException saying port 61616 is already in use. How do I configure this to use my server that is already running? I've tried changing 'localhost' to '127.0.0.1' and to my LAN ip, but no luck, it keeps trying to setup its own embedded activemq server. Any ideas?

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• Best way to parse XMPP-like XML streams?

  - by codethief

  I am working on a server application which receives data over a TCP socket in an XMPP-like XML format, i.e. every child of the <root> element essentially represents one separate request (stanza). The connection is closed as soon as </root> is received. I do know that I must use a stream parser like SAX, somehow. Though, for convenience, I'd prefer to have a tree-like interface to access each stanza's child elements. (The data sent with every request is not large so I think it makes sense to read each stanza as a whole.) What's the best way to realize that in Python (preferably v3)? This is the code I'd like to build it in. Feel free to point me in a totally different direction to solve this issue. import socketserver import settings class MyServer(socketserver.ThreadingMixIn, socketserver.TCPServer): pass class MyRequestHandler(socketserver.StreamRequestHandler): def handle(self): pass if __name__ == '__main__': server = MyServer((settings.host, settings.port), MyRequestHandler) server.serve_forever()

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• C++ Virtual keyword as away to avoid including code units.

  - by user394663

  Currently we have a body of code that allows service plugins which offer forms of communication to the core e.g tcp/ip, udp/ip, usb, etc... These service plugins feedback notifier class instances to the core for further processing. In the current implementation a service project (which is a separate dynamically linked library brought in at runtime by the core via dlopen and friends) will compile against the notifier.cpp file that resides in the core source code (a separate project). This gives access to the notifiers method implementations. This works perfectly no complaints. Two alternative options: 1. put the notifier method implementations in the header file. 2. declare the notifier methods virtual and delay binding until runtime. Avoiding the issues of computational overhead what are the impacts of option 2? Are there any other options available to us? Thanks

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• Socket receive buffer size

  - by Kanishka

  Is there a way to determine the receive buffer size of a TCPIP socket in c#. I am sending a message to a server and expecting a response where I am not sure of the receive buffer size. IPEndPoint ipep = new IPEndPoint(IPAddress.Parse("192.125.125.226"),20060); Socket server = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp); server.Connect(ipep); String OutStr= "49|50|48|48|224|48|129|1|0|0|128|0|0|0|0|0|4|0|0|32|49|50"; byte[] temp = OutStr.Split('|').Select(s => byte.Parse(s)).ToArray(); int byteCount = server.Send(temp); byte[] bytes = new byte[255]; int res=0; res = server.Receive(bytes); return Encoding.UTF8.GetString(bytes);

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• Cache an FTP connection for use via AJAX?

  - by Chad Johnson

  I'm working on a Ruby web Application that uses the Net::FTP library. One part of it allows users to interact with an FTP site via AJAX. When the user does something, and AJAX call is made, and then Ruby reconnects to the FTP server, performs an action, and outputs information. Every time the AJAX call is made, Ruby has to reconnect to the FTP server, and that's slow. Is there a way I could cache this FTP connection? I've tried caching in the session hash, but "We're sorry, but something went wrong" is displayed, and a TCP dump is outputted in my logs whenever I attempt to store it in the session hash. I haven't tried memcache yet. Any suggestions?

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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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• New thread per client connection in socket server?

  - by Olaseni

  I am trying to optimize multiple connections per time to a TCP socket server. Is it considered good practice, or even rational to initiate a new thread in the listening server every time I receive a connection request? At what time should I begin to worry about a server based on this infrastructure? What is the maximum no of background threads I can work, until it doesn't make any sense anymore? Platform is C#, framework is Mono, target OS is CentOS, RAM is 2.4G, server is on the clouds, and I'm expecting about 200 connection requests per second.

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• Would Python's Twisted library be the best case for an observer type pattern?

  - by beagleguy

  hi all, I'm developing a system where a queue will be filled with millions of items I need a process that reads items from the queue constantly and then sends those items out to registered clients. I'm thinking about using twisted for this, having the queue reader be a twisted server listening on a tcp port then clients can connect on that port and when an item is pulled from the queue the server writes it out to all the clients. Does that sound like something that twisted would be ideal for? Does anyone know of any sample code out there that may do something similar? thanks

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• Sending a large file over network continuously

  - by David Parunakian

  Hello, We need to write software that would continuously (i.e. new data is sent as it becomes available) send very large files (several Tb) to several destinations simultaneously. Some destinations have a dedicated fiber connection to the source, while some do not. Several questions arise: We plan to use TCP sockets for this task. What failover procedure would you recommend in order to handle network outages and dropped connections? What should happen upon upload completion: should the server close the socket? If so, then is it a good design decision to have another daemon provide file checksums on another port? Could you recommend a method to handle corrupted files, aside from downloading them again? Perhaps I could break them into 10Mb chunks and calculate checksums for each chunk separately? Thanks.

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• WCF Diagnostics tracing and WAS hosting?

  - by Per Salmi

  I have a WAS hosted set of services configured to use net.tcp running under an IIS AppPool user account. When hosting the services with WAS I have a hard time getting any diagnostic tracing out of them to track down problems. The same services with tracing set to use i.e. c:\logs\trace.svclog as trace output works fine when using self-hosting in a console application. I don't seem to get any trace output at all when hosting with WAS, are there any special settings I need to get trace output under WAS? I have set a fixed output path for tracing and assigned permissions to the folder for the IIS AppPool\MyAppPool-user. /Per Salmi

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• Cannot add App_Data SQL Server database

  - by Interfector

  Hello, Using Visual Studio 2010 10.0.20319.1 RTMRel and SQL Server Express 10.50.1600.1 I'm trying to add a new SQL Server Database .mdf, however, I receive the following error: 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: 25 – Connection string is not valid) I have enabled TCP/IP and Named Pipelines, added Firewall Exceptions for Sql Server, I am successfully connecting from VS in the Server Explorer window. I would appreciate if someone can pint me to a solution to my problem. Thank you.

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• Recieve and forward all packets to another port

  - by question

  Debian 5, iptables Server N1 Some video-streaming server without external IP. Server N2 Debian server with ip 1.1.1.1. Server N1 is configured to send videostream to 1.1.1.1:1111. How to forward all recieved packages from 1.1.1.1:1111 to another port on the same server, for example to 1.1.1.1:2222? Something like that? echo 1 > /proc/sys/net/ipv4/ip_forward iptables -t nat -A PREROUTING -i eth1 -p tcp --dport 1111 -j REDIRECT --to-port 2222

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• How to create a voldemort store?

  - by Pankaj

  I am trying to understand the Voldemort java API. I am new to non relational databases, so as I understand, Voldemort's store can be compared to a table in relational model. I saw the following code in the documentation. String bootstrapUrl = "tcp://localhost:6666"; StoreClientFactory factory = new SocketStoreClientFactory(new ClientConfig().setBootstrapUrls(bootstrapUrl)); // create a client that executes operations on a single store StoreClient client = factory.getStoreClient("test"); Here, we got a Store client based on the an existing store (test). How can I actually create a store for Voldemort through java?

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• what happens when I don't manage to call `recv` fast enough?

  - by amn

  Hi all, I want to account for a possible scenario where clients of my TCP/IP stream socket service send data to my service faster than it manages to move the data to its buffers (I am talking about application buffers, naturally) with recv and work with it. So basically, what happens in such scenarios? Obviously, some sort of service beneath my service which is a user application, has to receive incoming stream and store it somewhere until I issue 'recv', right? Most certainly the operating system. I don't want to re-open old questions, but I can't seem to find an answer to this seemingly obvious one?

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• Sharepoint Web performance optimization

  - by hertzel

  We are running on SSL on following server topology: 1 ISA (SSL Terminate/cache/proxy+AD authentication) 1 Sharepoint 1 IBM DB2 Database as enterprise/corporate DB 1 MS SQL Server as local DB We have recently optimized the caching, compression, minification, and other ASP.net best practices such as viewstate and cookie sizes, minimizing round trips, parallel connections/domain sharding and a lot more.... Now we are not convinced that the we are in an optimized position as the network resources i.e. bandwidth and especially latency are out of our control!! The client/browser to server/sharepoint is trans-Atlantic i.e. (ASIA, USA, EUROPE). As of my understanding the only ways to improve the network (latency) are: - TCP/SSL optimization - hardware/software? - CDNs - cloud or our own ? Your opinion and insights would be much appreciated Best regards Hertzel

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• Has anyone properly interpreted HTTP request based on this demo of winpcap?

  - by httpinterpret

  The example is here, and I tried it by changing the filter to tcp and dst port 80 and the following: void packet_handler(u_char *param, const struct pcap_pkthdr *header, const u_char *pkt_data) { .... ip_len = (ih->ver_ihl & 0xf) * 4; tcp_len = (((u_char*)ih)[ip_len + 12] >> 4) * 4; tcpPayload = (u_char*)ih + ip_len + tcp_len; /* start of url - skip "GET " */ url = tcpPayload + 4; end_url = strchr((char*)url, ' '); url_length = end_url - url; final_url = (u_char*)malloc(url_length + 1); strncpy((char*)final_url, (char*)url, url_length); final_url[url_length] = '\0'; printf("%s\n", final_url); .... } But through debug, I see tcpPayload is full of messy code,not supposed "GET ..." stuff. What's wrong with my implement?

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• How to measure the time taken by C# NetworkStream.Read?

  - by publicENEMY

  I want to measure time taken for client to receive data over tcp using c#. Im using NetworkStream.Read to read 100 megabits of data that are sent using NetworkStream.Write. I set the buffer to the same size of data, so there no buffer underrun problem etc. Generally it looks like this. Stopwatch sw = new Stopwatch(); sw.Start(); stream.Read(bytes, 0, bytes.Length); sw.Stop(); The problem is, there is a possibility where the sender hasnt actually sent the data but the stopwatch is already running. how can i accurately measure the time taken to receive the data? i did try to use the time lapse of the remote pc stream.Write, but the time it took to write is extremely small. by the way, is the stopwatch is the most accurate tool for this task?

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• Good way to send a large file over a network in C#?

  - by BFreeman

  I am trying to build an application that can request files from a service running on another machine in the network. These files can be fairly large (500mb + at times). I was looking into sending it via TCP but I'm worried that it may require that the entire file be stored in memory. There will probably only be one client. Copying to a shared directory isn't acceptable either. The only communication required is for the client to say "gimme xyz" and the server to send it (and whatever it takes to ensure this happens correctly). Any suggestions?

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• Twisted: how-to bind a server to a specified IP address? (solved)

  - by daccle

  I want to have a twisted service (started via twistd) which listens to TCP/POST request on a specified port on a specified IP address. By now I have a twisted application which listens to port 8040 on localhost. It is running fine, but I want it to only listen to a certain IP address, say 10.0.0.78. How-to manage that? This is a snippet of my code: application = service.Application('SMS_Inbound') smsInbound = resource.Resource() smsInbound.putChild('75sms_inbound',ReceiveSMS(application)) smsInboundServer = internet.TCPServer(8001, webserver.Site(smsInbound)) smsInboundServer.setName("SMS Handling") smsInboundServer.setServiceParent(application)

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