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  • Can a Linux system crash cause network issues?

    - by Supratik
    I have a Ubuntu box in my network which crashed, all the system connected to the switch in which the Ubuntu system was connected started giving problem. I removed that system from the network, since that was the last change I made in my network and everything was fine. So, to confirm this I again connected the system back to the network and the same network outage happened. When I checked the links it was fine. When I rebooted the problematic system and again connected back to the network switch everything started working. I think possibly the crash of the Ubuntu system could have caused this outage. Is there any possibility that a kernel crash can cause network issues?

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  • Failed GRUB after 10.04 to 12.04 upgrade in system with LVM

    - by Vagelis L
    I am using Ubuntu Server as a SMB server at work and two days ago I have tried to upgrade it to 12.04. After reboot, I got this grub_xput missing grub rescue> and all attempts to start from this prompt failed (missing components, although grub directory is normally set as prefix). My system sits and boots on an LVM (soft raid-5). I have read almost all posts in many forums, tried grub rescue, boot-repair, ubuntu-secure-remix with boot-repair but without positive result. This is the log of my last (and best so far) attempt to fix this system. Any suggestions? Please help.

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  • Multiple vulnerabilities in Firefox web browser

    - by chandan
    CVE DescriptionCVSSv2 Base ScoreComponentProduct and Resolution CVE-2011-3062 Numeric Errors vulnerability 6.8 Firefox web browser Solaris 11 11/11 SRU 9.5 Solaris 10 SPARC: 145080-11 X86: 145081-10 CVE-2012-0467 Denial of service (DoS) vulnerability 10.0 CVE-2012-0468 Improper Restriction of Operations within the Bounds of a Memory Buffer vulnerability 10.0 CVE-2012-0469 Resource Management Errors vulnerability 10.0 CVE-2012-0470 Improper Restriction of Operations within the Bounds of a Memory Buffer vulnerability 10.0 CVE-2012-0471 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability 4.3 CVE-2012-0473 Numeric Errors vulnerability 5.0 CVE-2012-0474 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability 4.3 CVE-2012-0477 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability 4.3 CVE-2012-0478 Permissions, Privileges, and Access Controls vulnerability 9.3 CVE-2012-0479 Identity spoofing vulnerability 4.3 This notification describes vulnerabilities fixed in third-party components that are included in Sun's product distribution.Information about vulnerabilities affecting Oracle Sun products can be found on Oracle Critical Patch Updates and Security Alerts page.

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  • Are scheduled job servers the right choice for a time sensitive game engine?

    - by maple_shaft
    I am currently architecting and designing an exciting new web application that will be entering into some areas that I have very little experience in, game development. The application is not necessarily a game, but there are some very time sensitive tasks and scheduled jobs that a server will need to run to perform game related activities (Eg. New match up starts at noon every day for a 12 day tournament, updating scoreboards at 5pm every day, etc...) In the past I have typically used cron jobs with the Quartz Scheduler running within a web application server, but I know that this isn't likely a scalable solution for the truly massive userbase that management is telling me to expect (Granted they are management and are probably highly optimistic about this) and also for how important the role of these tasks are in this web application. The other important thing I want to consider is that I want to avoid SPOF (Single Point Of Failure). If the primary job server goes down, another job server should be able to successfully run the job in its place. I suppose this can be done appropriately record locking and database transactions. My question is if scheduled jobs like CRON running on a web application server are a wise design choice given the time sensitive game tasks of this application, or is there something more appropriate for running a scalable game engine parallel to the web application servers?

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  • HFS+/How to convert an XFS file system to HFS+ [on hold]

    - by user219350
    I have repeatedly convinced of the reliability of the XFS file system , and I was more than satisfied . I was happy with everything in Ubuntu 14.04 ( great software) , but there is a little "but ! " Basically, I work on OSX-Mavericks 10.9.3, which sees very Windows 8.1 and works wonders with NTFS, but Ubuntu does not see! Briefly describe the equipment: ASRock B75 Pro3-M i5 3330 GeForce GTX 650 Ti SATA 500GB running OS X Mavericks + Clover - a boot disk Toshiba 2TB running Windows 8.1 (x64) and Ubuntu 14.04 (amd64) If you boot from the Toshiba (where there is Ubuntu and boot Windows + GRAB) after restart boot from Clover, it is impossible. Tried a lot of options - as Clover installation and boot priority, and various settings Grab, but have not found an acceptable option and reinstall again Clover - no desire ( Mavericks 20 seconds reboots - excellent !) So please help on the file system - how to convert to XFS HFS + magazine . Mavericks to saw it all synced on Mac . Thank you for the sensible answer and help! Originally in Russian.

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  • Utilisez-vous le framework Web JBoss Seam destiné à simplifier le développement d'applications Web ? Partagez votre expérience

    L'équipe Java vous propose un débat concernant le framework Web JBoss Seam. Ce framework, disponible depuis début 2005 et proposé par Gaving King le créateur d'Hibernate, veut simplifier le développement d'applications Web. Pour cela Seam se base sur les standards EJB3 et JSF proposés par Java EE et se focalise à réduire la complexité de ces différentes briques (voir article Présentation globale de Seam pour les principes de base). Aujourd'hui Seam atteint la version 3 et offre de nombreuses avancées pour simplifier le développement Web. En parallèle, de nombreux framework Web ont déjà su s'...

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  • Upgrade to Precise leaving system unbootable

    - by Talemon
    I've upgraded our server's system from Lucid to Precise and as far as I can tell, it left the system in an un-bootable state. I've read many responses in different threads but my problem has a twist. When we boot the server, it says The disc drive for / is not ready yet or not present Continue to wait; or press S to skip mounting or M for manual recovery but when I press any of those buttons, it doesn't do anything. I can't boot to any recovery console, and as it is a server and I'm accessing it via iDRAC, there's not much I can do.

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  • What measures should be taken to prevent File System Object from accessing directories of other customers on an IIS shared web host?

    - by sean e
    We have our website on an IIS shared hosting server. While working on a file monitor for our site, we have found that the File System Object allows us to enumerate the directories and files of other customers that are on the same server as us. Attempting to enumerate files in some root customer directories results in access denied errors - but not all. Is this an IIS configuration error? A Windows configuration error? How can we direct our hosting company to fix the problem?

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  • Adding multiple data importers support to web applications

    - by DigiMortal
    I’m building web application for customer and there is requirement that users must be able to import data in different formats. Today we will support XLSX and ODF as import formats and some other formats are waiting. I wanted to be able to add new importers on the fly so I don’t have to deploy web application again when I add new importer or change some existing one. In this posting I will show you how to build generic importers support to your web application. Importer interface All importers we use must have something in common so we can easily detect them. To keep things simple I will use interface here. public interface IMyImporter {     string[] SupportedFileExtensions { get; }     ImportResult Import(Stream fileStream, string fileExtension); } Our interface has the following members: SupportedFileExtensions – string array of file extensions that importer supports. This property helps us find out what import formats are available and which importer to use with given format. Import – method that does the actual importing work. Besides file we give in as stream we also give file extension so importer can decide how to handle the file. It is enough to get started. When building real importers I am sure you will switch over to abstract base class. Importer class Here is sample importer that imports data from Excel and Word documents. Importer class with no implementation details looks like this: public class MyOpenXmlImporter : IMyImporter {     public string[] SupportedFileExtensions     {         get { return new[] { "xlsx", "docx" }; }     }     public ImportResult Import(Stream fileStream, string extension)     {         // ...     } } Finding supported import formats in web application Now we have importers created and it’s time to add them to web application. Usually we have one page or ASP.NET MVC controller where we need importers. To this page or controller we add the following method that uses reflection to find all classes that implement our IMyImporter interface. private static string[] GetImporterFileExtensions() {     var types = from a in AppDomain.CurrentDomain.GetAssemblies()                 from t in a.GetTypes()                 where t.GetInterfaces().Contains(typeof(IMyImporter))                 select t;       var extensions = new Collection<string>();     foreach (var type in types)     {         var instance = (IMyImporter)type.InvokeMember(null,                        BindingFlags.CreateInstance, null, null, null);           foreach (var extension in instance.SupportedFileExtensions)         {             if (extensions.Contains(extension))                 continue;               extensions.Add(extension);         }     }       return extensions.ToArray(); } This code doesn’t look nice and is far from optimal but it works for us now. It is possible to improve performance of web application if we cache extensions and their corresponding types to some static dictionary. We have to fill it only once because our application is restarted when something changes in bin folder. Finding importer by extension When user uploads file we need to detect the extension of file and find the importer that supports given extension. We add another method to our page or controller that uses reflection to return us importer instance or null if extension is not supported. private static IMyImporter GetImporterForExtension(string extensionToFind) {     var types = from a in AppDomain.CurrentDomain.GetAssemblies()                 from t in a.GetTypes()                 where t.GetInterfaces().Contains(typeof(IMyImporter))                 select t;     foreach (var type in types)     {         var instance = (IMyImporter)type.InvokeMember(null,                        BindingFlags.CreateInstance, null, null, null);           if (instance.SupportedFileExtensions.Contains(extensionToFind))         {             return instance;         }     }       return null; } Here is example ASP.NET MVC controller action that accepts uploaded file, finds importer that can handle file and imports data. Again, this is sample code I kept minimal to better illustrate how things work. public ActionResult Import(MyImporterModel model) {     var file = Request.Files[0];     var extension = Path.GetExtension(file.FileName).ToLower();     var importer = GetImporterForExtension(extension.Substring(1));     var result = importer.Import(file.InputStream, extension);     if (result.Errors.Count > 0)     {         foreach (var error in result.Errors)             ModelState.AddModelError("file", error);           return Import();     }     return RedirectToAction("Index"); } Conclusion That’s it. Using couple of ugly methods and one simple interface we were able to add importers support to our web application. Example code here is not perfect but it works. It is possible to cache mappings between file extensions and importer types to some static variable because changing of these mappings means that something is changed in bin folder of web application and web application is restarted in this case anyway.

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  • Event Handlers and Automatic Postback in ASP.NET 3.5 Web Controls

    In one of last week s tutorials Creating Database-Driven ASP.NET 3.5 Input and List Web Controls you learned how to create a dynamic input web control that instead of setting values statically stored its list and values directly from the MS SQL server 2 8 database. This tutorial is a sequel to that article. It deals mostly with the server side coding aspect of dynamic web controls. It is recommended that you read the earlier tutorial first as the Visual Web Developer Project in that tutorial will be used extensively in this article.... Download a Free Trial of Windows 7 Reduce Management Costs and Improve Productivity with Windows 7

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  • Environment Award for AgroSense Java Farm Management System

    - by Geertjan
    Beating IBM's energy information system and Evoswitch's modular data central hall, Ordina's AgroSense, a farm management system for precision agriculture, received the prestigious IT Environment Award in the Netherlands yesterday. AgroSense is an agricultural services platform created in Java on the NetBeans Platform. It looks like this: Among other things, the team has been investigating whether and how to integrate JavaFX games into the AgroSense platform, as well as other JavaFX-oriented effects. Here's a pic of the red tulip award that the team received yesterday at a black tie award ceremony: The original announcement of the nominations for this competition in English can be read here. On Twitter, you can follow the AgroSense project here: @AgroSense Congratulations, AgroSense team, for this fantastic achievement!

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  • Why is the System process listening on Port 443?

    - by ClearsTheScreen
    I am having problems starting my apache server, because port 443 is already in use. It turns out, the system process (PID 4) uses the port 443. I don't have IIS installed, the services.msc shows (predicatbly) no Exchange server running, nor WWW-Services, nor IIS. I have no idea how to find out what service uses that port short of just disabling each service one after the other, and I am not even sure that would help. I would be grateful if someone could point me towards how I can get my SSL port back, thank you :) P.S.: Of course "just switch apache to another port for SSL" would solve the problem of not being able to start apache. But I'd still like to know what is so insistent about hogging port 443. :)

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  • Setting up a LAMP VM server for Development and Testing?

    - by TdotThomas
    Info: I would like to set up a VM server on my local computer which will serve pages in the exact same way as my current hosting (but only to me on my local computer). I currently pay a big web hosting company to host my website & web store and they are doing a great job, but I would like to be able to work on my Web site and its corresponding MySQL DB, HTML, and PHP code without being at risk of messing something completely up on the live servers. My current plan of action: Set up a VM webserver with Debian, MySQL, PHP, Apache. Copy web store (PHP/HTML) code to VM server. Copy my current MySQL databases from my hosting provider and install on VM server. Modify and test new features on VM server. Upload MySQL DB and HTML/PHP code back to web host's server where it should work as before but with new modifications. Questions: Now I'm pretty sure I have steps one and two down correctly but I can't for the life of me figure out how to proceed next, so here are my questions. I have my /etc/host file set up so www.MySite.test redirects to the IP address of the local VM webserver. Once I import my PHP/HTML files and MySQL file whats the best way to navigate around the fact that all of my files and DBs will reference www.MySite.com. I can export my MySQL dbs but do I also have to export my MySQL users and passwords to access those db or are those coded into my html/php code?

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  • Une API pour le service de raccourcissement d'URL de Google à la disposition des développeurs Web

    Une API pour le service de raccourcissement d'URL de Google Est mise à la disposition des développeurs Web Google vient de publier une API pour Goo.gl, son service de raccourcissement d'URL. L'API permettra aux développeurs d'intégrer le service Goo.gl à leurs pages Web et à leurs différents projets Web. Le service de raccourcissement d'URL Goo avait été déployé par Google en 2009 pour se lancer sur le marché des « URL-Shortner » et concurrencer ainsi Bit.ly. Depuis son lanc...

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  • How to build a good service layer in ASP.NET?

    - by Swippen
    I have looked through some questions, technologies for building a good service layer but I have some questions regarding this that I need help with. First some information of what I have for requirements. We currently have a number of web applications that talk to each other in a spiderweb looking way (all talking to each other in a confusing way via webservices and database data). We want to change this so that all applications go through a service layer where we can work more with cache and encapsulate common functionality and more. We want this layer to also have a Web API so that 3rd party clients can consume information from the service. The problem I see is that if we build the service layer with say MVC4 Web API don't we need to communicate between the application using the webAPI meaning we have to construct URLs and consume JSON/Xml. That does not sound too effective. I assume a better method would be working with entities and WCF to communicate between the application but then we might loose the Web API magic? So the question is if there is a way to consume a service layer as both a Web API (JSON/XML) and as a more backend service layer with entities. If we are forced to use 2 different service layers we might have to duplicate some functionality and other bad things. Hope the question is clear enough and please ask if you need any more information.

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  • Releasing patches and updates to web service users

    - by Kalidoss.M
    I have written one web services using Java. Its already live (Up & Running). During development I have SVN(repository) + Jira for task maintenance + Maven for building the web services. Now i have some small update for my web services and i have created that task in Jira and committed the files in svn with respect to Jira-Id after all testing, etc.. Say my web services is used by 10 clients, we did not give our source code to them. Is there any steps/procedure available to release patch/updates? Is there any way to render/create the change log at the build time (maven). How do i manage the change log for all version or Patch updates during build time? (Automatically)

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  • Combining a content management system with ASP.NET

    - by Ek0nomik
    I am going to be creating a site that seems like it requires a blend of a content management system (CMS) and some custom web development (which is done in ASP.NET MVC). I have plenty of web development experience to understand the ASP.NET MVC side of the fence, but, I don't have a lot of CMS knowledge aside from getting one stood up. Right now my biggest question is around integrating security from ASP.NET with the CMS. I currently have an ASP.NET MVC site that handles the authentication for multiple production sites and creates an authentication cookie under our domain (*.example.com). The page acts like a single sign on page since the cookie is a wildcard and can be used in any other applications of the same domain. I'd really like to avoid having users put in their credentials twice. Is there a CMS that will play well with the ASP.NET Forms Authentication given how I have these existing applications structured? As an aside, right now I am leaning towards Drupal, but, that isn't finalized.

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  • Managing a Web Portal

    - by A competent translator
    After skimming almost all questions tagged "books" here at Pro Webmasters to find a book on managing web portals I found references to general web mastering. Are there books on managing and curating content of public web portals , i.e. a governmental portal for a given department or agency ? I need a reference on the day-to-day management and best practices of a portal and its content. Also welcomed are references on managing multilingual portals.

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  • Building an instance system.

    - by Kyle C
    I am looking into how to design an instance system for the game I am working on. I have always wondered how these are created in games like World of Warcraft, where instances == dungeons/raids/etc). Areas that are separated from players other than those in your group, but have specific logic to them. Specifically how can you reuse your existing code base and not have a bunch of checks everywhere ? if (isInstance) do x; else do y; I don't know if this will make too much of a difference on any answers, but we're using a pretty classic "Object as pure aggregation" component system for our entities.

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