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• If a managed network switch were to overheat, would you consider it no longer reliable?

  - by Scott Szretter

  Here is the scenario - I have a network switch, one of several in a stack. It's fan failed. Soon, there were reports of users with network issues. After quickly replacing the fan, the users were fine, network issues were resolved. I assume the unit was overheating, and thus failing somehow. Today someone suggested to me, that I should not assume the unit is 100% reliable anymore. So what do you think, would an overheat condition (less than 1 day with the fan stopped) potentially cause permanent damage that could at some point come to the surface as future network failures/issues? If it matters, we are talking managed switches such as 3Com/HP SuperStack , ProCurve or PWR-Plus.

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• Advantages of Singleton Class over Static Class?

  Point 1)Singleton We can get the object of singleton and then pass to other methods.Static Class We can not pass static class to other methods as we pass objectsPoint 2) Singleton In future, it is easy to change the logic of of creating objects to some pooling mechanism. Static Class Very difficult to implement some pooling logic in case of static class. We would need to make that class as non-static and then make all the methods non-static methods, So entire your code needs to be changed.Point3:) Singleton Can Singletone class be inherited to subclass? Singleton class does not say any restriction of Inheritence. So we should be able to do this as long as subclass is also inheritence.There's nothing fundamentally wrong with subclassing a class that is intended to be a singleton. There are many reasons you might want to do it. and there are many ways to accomplish it. It depends on language you use.Static Class We can not inherit Static class to another Static class in C#. Think about it this way: you access static members via type name, like this: MyStaticType.MyStaticMember(); Were you to inherit from that class, you would have to access it via the new type name: MyNewType.MyStaticMember(); Thus, the new item bears no relationships to the original when used in code. There would be no way to take advantage of any inheritance relationship for things like polymorphism. span.fullpost {display:none;}

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• What are the "must " security tools for small organizations ?

  - by Berkay

  One of my friend has started a company, it's a small-scale company that has a 40 workers.There is two guys also responsible for the security and IT related issues.He is managing the LAN, Webpage of the company, e-mail configuration, printer hardware modification, application deployment etc. In this point, to provide the security measures including access controls, authentication, web server security etc. Which tools do you use for securing, monitoring and controlling the system ? Are you paying for these tools or are they open source? This question is due to the security administrators requests to my friend.He offers to get some tools for the company and my friend hesitates to pay that much on them (what he mentioned me.)

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• Tool to annotate pictures (screenshots) for documentation purposes?

  - by René Nyffenegger

  Long time ago, I saw someone use a software (on Windows) that was specifically created to annotate pictures. It made it simple to add arrows, boxes, circles in "outstanding" colors to the image. Unfortunatly, I don't remember what program that was. Now, I have to document a GUI and I'd like to use this software in order to annotate screenshots of the software so that I can show the order of flow and dependencies between various aspects of the GUI. I'd be very happy if someone could point me into the right direction.

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• Why do I get Apps in Windows 8 listed as 'Not available' sometimes?

  - by keith

  What affects this, and if possible, how can I prevent this? Or maybe how can I get them to be available sooner or all the time? This pretty much happens to my game apps connected to Xbox live and a few others from time to time. It never happened before I updated the computer, but I haven't had the PC long anyway. Could it be that after updates that need a restart it does this as well (I've done two of those so far)? Anyhow, I'm frustrated, I keep clicking on a app and it not responding. The problem fixes itself at some point, but I have not been able to stare at my PC long enough to figure out how long it takes or what happened.

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• Creative software leftovers - ASIO error message

  - by Tony Patriarche

  I temporarily installed an old Creative Audigy 2 soundboard on my Vista x64 Home Premium computer. Bad idea! I uninstalled the board & all software visible on the control panel. Now, with one particular app. (Sibelius) I keep getting a start-up message "CTASIO Warning: Creative ASIO: there are no Creative audio products installed on the system that support ASIO". I offer this as a candidate for "Most useless message", but that's beside the point. I used a commercial registry cleaner (PC-Tools Registry Mechanic) and then edited the registry looking for "creative", "audigy" and "ASIO". After removing everything I could find, I still get the message. Any suggestions?

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• Switch computer off automatically when the internet is disconnected

  - by Vin

  Is there any free software that will detect the status of internet and shutdown the system when the internet disconnects? Or (more generally) can something run a task when the internet disconnects, and I can route it to shutdown the machine? I am downloading things overnight. But my problem is that sometimes the internet connection will be disconnected in the middle of the night, so there is no point in keeping the system running the rest of the night. So I need to avoid this problem by detecting the net connectivity.

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• VBO and shaders confusion, what's their connection?

  - by Jeffrey

  Considering OpenGL 2.1 VBOs and 1.20 GLSL shaders: When creating an entity like "Zombie", is it good to initialize just the VBO buffer with the data once and do N glDrawArrays() calls per each N zombies? Is there a more efficient way? (With a single call we cannot pass different uniforms to the shader to calculate an offset, see point 3) When dealing with logical object (player, tree, cube etc), should I always use the same shader or should I customize (or be able to customize) the shaders per each object? Considering an entity class, should I create and define the shader at object initialization? When having a movable object such as a human, is there any more powerful way to deal with its coordinates than to initialize its VBO object at 0,0 and define an uniform offset to pass to the shader to calculate its real position? Could you make an example of the Data Oriented Design on creating a generic zombie class? Is the following good? Zombielist class: class ZombieList { GLuint vbo; // generic zombie vertex model std::vector<color>; // object default color std::vector<texture>; // objects textures std::vector<vector3D>; // objects positions public: unsigned int create(); // return object id void move(unsigned int objId, vector3D offset); void rotate(unsigned int objId, float angle); void setColor(unsigned int objId, color c); void setPosition(unsigned int objId, color c); void setTexture(unsigned int, unsigned int); ... void update(Player*); // move towards player, attack if near } Example: Player p; Zombielist zl; unsigned int first = zl.create(); zl.setPosition(first, vector3D(50, 50)); zl.setTexture(first, texture("zombie1.png")); ... while (running) { // main loop ... zl.update(&p); zl.draw(); // draw every zombie }

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• MS Word - Close Word when you close the last open document **using keyboard**

  - by Chad

  In MS Word, by default, you can use: Ctrl+F4 to close Word Ctrl+W to close the current document Is it possible to make Word close when you close the last open document? For instance, in Chrome, if you keep hitting Ctrl+W you'll eventually close the last tab, which will also close Chrome. I'd like the same functionality with Word (and the other Office products) where I can just keep closing documents until I close the last one, at which point the application closes. Unfortunately, Ctrl+W doesn't close Word, even when there are no documents open.

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• Mac OS X bash: uninstall all apache and PHP occurences

  - by fireeyedboy

  Hi all, How do I find all installed apache and PHP occurences on a Mac OS X system in bash and uninstall them? My motivation: I've managed to install multiple apache and PHP packages (I believe it's called packages in Unix terms, correct?) at some point, and I'ld like to start out fresh again, without completely re-installing Mac OS X again. Also, I'ld like to install suPHP along with apache this time, and I believe I need to compile apache with some additional stuff for that. But that is a challenge I'll deal with later, and probably ask a question about then. :) Thank you in advance for your info.

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• "VLC could not read the file" error when trying to play DVDs

  - by stephenmurdoch

  I can watch most DVD's on my machine using VLC but today, I went to watch Thor, and it won't play. libdvdread4 and libdvdcss2 are at the latest versions. vlc -v returns 1.1.4 w32codecs are installed and reinstalled ubuntu-restricted-extras are same as above My machine recognises the disc and I can open the folder and browse the assorted .vob files, of which there are many. None of them will open in VLC, or in MPlayer etc. When I run vlc -vvv /media/THOR/VIDEO_TS/VTS_03_1.VOB I get: File Reading Failed VLC could not read the file I also see command line output like this: [0x963f47c] main filter debug: removing module "swscale" [0x963a4b4] main generic debug: A filter to adapt decoder to display is needed [0x964be84] main filter debug: looking for video filter2 module: 18 candidates [0x964be84] swscale filter debug: 720x576 chroma: I420 -> 979x551 chroma: RV32 with scaling using Bicubic (good quality) [0x964be84] main filter debug: using video filter2 module "swscale" ..... [0x959f4e4] main video output warning: late picture skipped (-10038 > -15327) [0x963a4b4] main generic debug: auto hidding mouse [0x93ca094] main input warning: clock gap, unexpected stream discontinuity [0x93ca094] main input warning: feeding synchro with a new reference point trying to recover from clock gap [0x959f4e4] main video output warning: early picture skipped ...... ac-tex damaged at 0 12 ac-tex damaged at 6 20 ac-tex damaged at 12 28 This happens with onboard and Known Good USB DVD player I don't have standalone DVD player to try with TV I am going to watch another film instead for now, because I can do that. I just can't watch THOR, and I'm pretty confident that the disc is ok. It is a rental, but it's clean and there are no surface abrasions. I even cleaned it with Christian Dior aftershave to make sure.

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• Guidance in naming awkward domain-specific objects?

  - by GlenH7

  I'm modeling a chemical system, and I'm having problems with naming my objects within an enum. I'm not sure if I should use: the atomic formula the chemical name an abbreviated chemical name. For example, sulfuric acid is H2SO4 and hydrochloric acid is HCl. With those two, I would probably just use the atomic formula as they are reasonably common. However, I have others like sodium hexafluorosilicate which is Na2SiF6. In that example, the atomic formula isn't as obvious (to me) but the chemical name is hideously long: myEnum.SodiumHexaFluoroSilicate. I'm not sure how I would be able to safely come up with an abbreviated chemical name that would have a consistent naming pattern. From a maintenance point of view, which of the options would you prefer to see and why? Some details from comments on this question: Audience for the code will be just programmers, not chemists. I'm using C#, but I think this question is more interesting when ignoring the implementation language I'm starting with 10 - 20 compounds and would have at most 100 compounds. The enum is to facilitate common calculations - the equation is the same for all compounds but you insert a property of the compound to complete the equation. For example, Molar mass (in g/mol) is used when calculating the number of moles from a mass (in grams) of the compound. Another example of a common calculation is the Ideal Gas Law and its use of the Specific Gas Constant

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• Is anyone else using OpenBSD as a router in the enterprise? What hardware are you running it on?

  - by Kamil Kisiel

  We have an OpenBSD router at each of our locations, currently running on generic "homebrew" PC hardware in a 4U server case. Due to reliability concerns and space considerations we're looking at upgrading them to some proper server-grade hardware with support etc. These boxes serve as the routers, gateways, and firewalls at each site. At this point we're quite familiar with OpenBSD and Pf, so hesitant at moving away from the system to something else such as dedicated Cisco hardware. I'm currently thinking of moving the systems to some HP DL-series 1U machines (model yet to be determined). I'm curious to hear if other people use a setup like this in their business, or have migrated to or away from one.

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• Change Groupwise 7 User Password from NetWare Server Console

  - by Scott Wolf

  I have a Groupwise 7 server in place that we use for testing purposes. The previous administrator didn't bother to make a note of any of the account passwords on the machine. I have access to the Server Console...but I can't login via ConsoleOne or anything like that. Is there a command line utility that I can run from the Server Console to reset a Groupwise user password? I just need to have one account up and running for testing. If there's a CLI utility I can use to be able to create a new account, that would work just as well. Any help would be greatly appreciated...I'm kinda stuck at this point.

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• Is there a name for a testing method where you compare a set of very different designs?

  - by DVK

  "A/B testing" is defined as "a method of marketing testing by which a baseline control sample is compared to a variety of single-variable test samples in order to improve response rates". The point here, of course, is to know which small single-variable changes are more optimal, with the goal of finding the local optimum. However, one can also envision a somewhat related but different scenario for testing the response rate of major re-designs: take a baseline control design, take one or more completely different designs, and run test samples on those redesigns to compare response rates. As a practical but contrived example, imagine testing a set of designs for the same website, one being minimalist "googly" design, one being cluttered "Amazony" design, and one being an artsy "designy" design (e.g. maximum use of design elements unlike Google but minimal simultaneously presented information, like Google but unlike Amazon) Is there an official name for such testing? It's definitely not A/B testing, since the main component of it (finding local optimum by testing single-variable small changes that can be attributed to response shift) is not present. This is more about trying to compare a set of local optimums, and compare to see which one works better as a global optimum. It's not a multivriable, A/B/N or any other such testing since you don't really have specific variables that can be attributed, just different designs.

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• Do you ever worry that you're more concerned with how something is built rather than what you are actually building?

  - by Rob Stevenson-Leggett

  As a programmer I have an inherent nagging annoyance at my tools, other peoples code, my code, the world in general. I always want to improve it. So I refactor, I stay on top of the latest techniques. I try and learn patterns, I try to use frameworks so as not to reinvent the wheel. I can write a tech spec that will blow your socks off with the amount of patterns I can squeeze in. However, lately I feel I actually know more about the tools I use than how to actually implement successful software. I feel like I'm lacking in the human factors skill set and I believe that to be a successful software engineer takes more than knowing the coolest framework. I think it needs some of the following skillsets too. Interaction design User experience Marketing I've got a bit of this that I've learned from people I've worked with and great projects I've worked on but I don't feel like I "own" these skills. Am I right? Should I be trying to develop these skills further, or should these be left to the people who do these for a career? How do you make sure you don't get too tied up in how you're doing something and make sure you "make your users awesome"? Does anyone know of good resources for learning these skills from a programming point of view?

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• Tool to monitor file size, file existence, parse xml, etc

  - by Artur Carvalho

  I'm trying to find some tool that helps me monitor several things. What are some requirements: Shows results on a web page. Checks existence of files/folders Checks sizes of files/folders Can parse xml files Can have several status depending if it's for instance, after 9pm Ping workstations/Servers to ensure they are on or off create daily/weekly/monthly reports (pdf, html, csv) show daily/weekly/monthly scheduled tasks check if specific users are logged in a machine check which users are logged in in a machine I've looked into some solutions but could not find what I wanted. Usually tools like nagios are more focused in servers, and spiceworks is not so specific. At this point I'm using a little powershell script that does several of these items, but before losing more time probably reinventing the wheel, what tools are out there? Thank you in advance.

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• Xubuntu 12.04 : Random boot to black screen

  - by Thibaud Ruelle

  My xubuntu 12.04 has worked flawlessly since install in September. However, lately I randomly have the following boot issue : The computer boots to grub, and after choosing xubuntu either boots normally or boots to a black screen. Here are some observations I have made : The black screen seems to happen randomly. The black screen does not seem to happen in safe mode (- nomodeset in grub). The black screen does not allow me to ctrl + alt + F1-6 into a terminal. The black screen allows me to use SysRq keys (Alt + SysRq + K does not work though). The black screen often happens on first boot in several hours and the computer usually boots normally after a RSEINUB. When the computer boots I get "SP5100 TCO timer: mmio address 0xfec000f0 already in use" at startup and "Could not write bytes: broken pipe" at shutdown. However research on these errors did not yield answers to my particular issue. Comparing Xorg.0.log (successful boot) and Xorg.0.log.old (black screen), and reading the answers to similar problem, it seems that I might have a X driver issue. However the system worked flawlessly since lately. Additional info on my system : ACER AO722 C62kk Operating system : 3.2.0-31-generic ubuntu Edit : I made a fresh install of Xubuntu 12.04 x64, the issue is still there ... (I have a separate /home so config. files were not erased). Edit 2 : I followed troubleshooting blank screen, so my new observations are without quiet and splash in grub : When the system boots normally, the screen goes black after grub then lights up and displays text information then goes to login screen. (After that the desktop starting time vary substantially, which is new and may be a separate issue ?). When the boot fails, after grub the screen goes black, lights up, goes black, lights up again and most times goes black again. At this point it responds to Alt+SysReq K by lighting up but no more, and has to be rebooted through Alt+SysReq+ RSEINUB. Thank you for your time and attention in advance ! Thibaud Ruelle

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• MX Record for SubDomains

  - by Steve Sloka

  I want to be able to send email to any subdomain I like and not have to configure A records and MX records for each subdomain. Ideally I could send an email to [email protected] and [email protected] and not have to configure anything other than my original domain.com. My current setup: I have a domain (domain.com) and want to have multiple subdomains. (a.domain.com, b.domain.com, c.domain.com, etc). I have an MX record setup to point to domain.com and all email works fine for that domain. I have NOT setup A records for all the subdomains (and really don't want to).

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• Script to kill process at logoff doesn't execute until process is dead?

  - by robertc

  We have a program that, due to memory leaks in some of the screens, doesn't exit cleanly when the user quits. The problem is that this blocks the normal logoff procedure - you select logout and a few processes disappear but the user doesn't actually log off. Since I'm unable to fix the program, I thought I'd use a script run at logoff to kill the process. I've verified the script kills the process if I run it by double clicking and have added the script to Windows Settings - Scripts - Logoff on my machine in gpedit. Unfortunately it seems that the logoff scripts don't get run until all the processes have died, so it never runs. Is there a way to make the logoff scripts run at an earlier point in the process? Or is there a better approach to the issue?

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• Can't mount time capsule via wi-fi.

  - by Grnmntn

  I have an Apple time capsule, and have been able to back up to it without a problem for the past few months. However, today I found I cannot connect to the time capsule from Finder, though it appears there, when I click "connect as...", it takes a few seconds and then reports connect failed, "the server may not exist or it is not operational at this time. Check the server name or IP address and your network connection and try again". When I check Time Machine, it says the last backup failed because "the backup volume could not be mounted". The strange part is, the time capsule is also my router, and I am able to use the time capsule as a wireless access point without a problem. Any ideas?

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• verisign certificate into jboss server SSL

  - by rfders

  Hi all, i'm trying to enable jboss to uses ssl protocol using a previously generated certificate from verisign, i imported both certificate, server certificate and ca certificate into the keytore file, and i configured the server.xml to use that keystore and activate ssl protocol, then when i run the jboss, I got this error "certificate or key corresponds to the SSL cipher suites which are enabled" Question, reading some post on internet, i found that every example was made it generating a Certificate Request, it stricly necesary to do that if i already have the server certificate and that CSR has to be imported into the keystore as well ? at this point i'm very confused about this issue, i tried almost every solutions posted in several forums but till now i haven't any luck !! can you give me some tips in order to solve this problem. thanks in advance this are my keystore file: Keystore type: jks Keystore provider: SUN Your keystore contains 2 entries j2ee, Dec 29, 2009, trustedCertEntry, Certificate fingerprint (MD5): 69:CC:2D:2A:2D:EF:C4:DB:A2:26:35:57:06:29:7D:4C ugent, Dec 29, 2009, trustedCertEntry, Certificate fingerprint (MD5): AC:D8:0E:A2:7B:B7:2C:E7:00:DC:22:72:4A:5F:1E:92 and my server.xml configuration:

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• What is a good OS to mess around with Xen Dom0?

  - by earlz

  Hello, I'd like to experiment some with Xen. My problem is I do not know which OS to try to install it with. I use OpenBSD, but it can not run as Dom0 or DomU at this point. I use Arch Linux on my website's VPS, so I know it and like it. The support for Xen just doesn't seem to be there though. Can anyone suggest a nice (preferably lightweight, so not SUSE and such) Linux distro or *BSD to mess around with Xen in a non-production environment?

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• What is the current state of development for the FLAC codec?

  - by TwentyMiles

  I have a pretty large collection of FLAC files created from my CD collection. I love the FLAC format and the sound quality that you can get from it. Lately, however, I've been trying to write a few tools to manipulate the files and I've been noticing what seems to be a stagnation of the community around the codec. Some of the links on the official FLAC page point to thing that are no longer relevant (7digital, for example, appears to no longer sell FLAC encoded songs). It's pretty hard to find hardware players that support FLAC any more (most noticeably it's not present on lower end players when it used to be, and playback is absent on Android). Programming language tools (Java and .NET libraries) are at best old, and at worst unfinished. What's the current state of FLAC development? Has it been replaced by another codec?

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• dns update frequency

  - by Roderik

  I was looking after the frequency of dns updates, since I had to change the location fo the vps that hosts the domain contents. What I ussualy read is that it takes up to 72 hours to get these changes propagated, sometimes this can be sooner based on your location. I changed the nameservers for the domain vasco-da-gama.nl about a week ago. When I ping the domain name from different locations it still points the old vps (which does not exist anymore). I was wondering if its normal that it can take this long for the change to point my new vps? If I might have done something wrong here, where should I look for it (it looks all ok, when I check it). If it is reachable from your location (if so, its probably a matter of time it will propagate to my location).

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