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  • dead man's switch for remote networking interventions

    - by ascobol
    Hi, As I'm going to change the network configuration of a remote server, I was thinking of some security mechanisms to protect me from accidentally loosing control on the server. The level-0 protection I'm using is a scheduled system reboot: # at now+x minutes > reboot > ctrl+D where x is the delay before reboot. While this works relatevly well for very simple tasks like playing with iptables this method has at least two drawbacks: It's not very reactive, ie a connectivity problem should be detected automatically if for example an automatic remote ssh command fails does not work anymore for x seconds. It can obviously not work if one need to modify some configuration files and then reboot to test the changes. Are you guys using some tool for the second point ? I would love to have something able to revert the system configuration in a previously known stable state if I can't join the server X minutes after reboot. Thanks!

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  • Using screen, commands like less and man don't clear the screen afterwards

    - by Boldewyn
    In contrast to this question I want the clearing of the screen re-enabled for less. It works fine in my xterm terminal under Cygwin/mintty or Gnome Terminal (both xterms). However, when inside a screen session, the clearing of the screen is somehow disabled. I tried several things, like screen -T xterm or putting the autonuke statement in my ~/.screenrc. Also, inside the screen session export TERM=xterm tset has no effect. So, now I'm out of ideas. Any help appreciated.

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  • Any 3rd party tools that integrate IIS management with some sort of application inventory/change man

    - by NoCarrier
    I've got an environment with several IIS 6 web servers hosting hundreds of apps (dozens of sites, hundreds of virtual directories) all with a myriad of different configurations belonging to dozens of different developers (all deploying apps willy nilly). Is there some sort of managed software solution that will centralize management of all my IIS6 environments provide some inventory functionality allow for reporting or querying of said application inventory enforce and automate some sort of deployment process?

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  • cannot ssh to computer behind a dd-wrt bridge

    - by Jayaraman
    In my home network , i have dd-wrt router in another room , which bridges wifi from main home router (linksys) to the computers wired behind dd-wrt router. Now I cannot ssh from my laptop ( connected to linksys wifi) to the computers behind dd-wrt wifi bridge. I am able to ping the individual computers behind the dd-wrt bridge. When it comes to ssh or telnet to the computers , it is blocked. What can I do to make dd-wrt bridge to open up all ports in the dd-wrt bridge ?

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  • Watchguard firebox: public IP addresses behind firewall with as much usable IP addresses as possible

    - by martinezpt
    Our ISP assigned us 16 public IP addresses that we want to assign to hosts behind a Watchguard firebox x750e. The IP addresses are: x.x.x.176/28 of which x.x.x.177 is the gateway. The hosts will be running software that needs to be directly assigned the public IP address so 1:1 NAT is not an option. I found this document that gives examples on how to assign public IP addresses to hosts behind the firewall, using an optional interface: http://www.watchguard.com/help/configuration-examples/public_IP_behind_XTM_configuration_example_(en-US).pdf However, I can't implement scenario 1 as it won't allow me to use the same subnet on both interfaces. As for scenario 2, splitting the address range into 2 subnets will decrease the usable hosts on the optional interface to 5 (8 - network - broadcast - optional interface ip). I'm convinced that there must be a better way to address this problem and maximize the number of usable IP addresses but I'm not very familiar with this specific firewall. Are there any suggestions on how to keep the hosts behind the firewall with public IP addresses while maximizing the usable IP addresses? thanks

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  • Blocking IP's Nginx behind proxy

    - by FunkyChicken
    I'm running a Nginx 1.2.4 webserver here, and I'm behind a proxy of my hoster to prevent ddos attacks. The downside of being behind this proxy is that I need to get the REAL IP information from an extra header. In PHP it works great by doing $_SERVER[HTTP_X_REAL_IP] for example. Now before I was behind this proxy of my hoster I had a very effective way of blocking certain IP's by doing this: include /etc/nginx/block.conf and to allow/deny IP's there. But now due to the proxy, Nginx sees all traffic coming from 1 IP. Is there a way I can get Nginx to read the IP's like how PHP does, with the X-REAL-IP header?

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  • Behind ASP.NET MVC Mock Objects

    - by imran_ku07
       Introduction:           I think this sentence now become very familiar to ASP.NET MVC developers that "ASP.NET MVC is designed with testability in mind". But what ASP.NET MVC team did for making applications build with ASP.NET MVC become easily testable? Understanding this is also very important because it gives you some help when designing custom classes. So in this article i will discuss some abstract classes provided by ASP.NET MVC team for the various ASP.NET intrinsic objects, including HttpContext, HttpRequest, and HttpResponse for making these objects as testable. I will also discuss that why it is hard and difficult to test ASP.NET Web Forms.      Description:           Starting from Classic ASP to ASP.NET MVC, ASP.NET Intrinsic objects is extensively used in all form of web application. They provide information about Request, Response, Server, Application and so on. But ASP.NET MVC uses these intrinsic objects in some abstract manner. The reason for this abstraction is to make your application testable. So let see the abstraction.           As we know that ASP.NET MVC uses the same runtime engine as ASP.NET Web Form uses, therefore the first receiver of the request after IIS and aspnet_filter.dll is aspnet_isapi.dll. This will start the application domain. With the application domain up and running, ASP.NET does some initialization and after some initialization it will call Application_Start if it is defined. Then the normal HTTP pipeline event handlers will be executed including both HTTP Modules and global.asax event handlers. One of the HTTP Module is registered by ASP.NET MVC is UrlRoutingModule. The purpose of this module is to match a route defined in global.asax. Every matched route must have IRouteHandler. In default case this is MvcRouteHandler which is responsible for determining the HTTP Handler which returns MvcHandler (which is derived from IHttpHandler). In simple words, Route has MvcRouteHandler which returns MvcHandler which is the IHttpHandler of current request. In between HTTP pipeline events the handler of ASP.NET MVC, MvcHandler.ProcessRequest will be executed and shown as given below,          void IHttpHandler.ProcessRequest(HttpContext context)          {                    this.ProcessRequest(context);          }          protected virtual void ProcessRequest(HttpContext context)          {                    // HttpContextWrapper inherits from HttpContextBase                    HttpContextBase ctxBase = new HttpContextWrapper(context);                    this.ProcessRequest(ctxBase);          }          protected internal virtual void ProcessRequest(HttpContextBase ctxBase)          {                    . . .          }             HttpContextBase is the base class. HttpContextWrapper inherits from HttpContextBase, which is the parent class that include information about a single HTTP request. This is what ASP.NET MVC team did, just wrap old instrinsic HttpContext into HttpContextWrapper object and provide opportunity for other framework to provide their own implementation of HttpContextBase. For example           public class MockHttpContext : HttpContextBase          {                    . . .          }                     As you can see, it is very easy to create your own HttpContext. That's what did the third party mock frameworks like TypeMock, Moq, RhinoMocks, or NMock2 to provide their own implementation of ASP.NET instrinsic objects classes.           The key point to note here is the types of ASP.NET instrinsic objects. In ASP.NET Web Form and ASP.NET MVC. For example in ASP.NET Web Form the type of Request object is HttpRequest (which is sealed) and in ASP.NET MVC the type of Request object is HttpRequestBase. This is one of the reason that makes test in ASP.NET WebForm is difficult. because their is no base class and the HttpRequest class is sealed, therefore it cannot act as a base class to others. On the other side ASP.NET MVC always uses a base class to give a chance to third parties and unit test frameworks to create thier own implementation ASP.NET instrinsic object.           Therefore we can say that in ASP.NET MVC, instrinsic objects are of type base classes (for example HttpContextBase) .Actually these base classes had it's own implementation of same interface as the intrinsic objects it abstracts. It includes only virtual members which simply throws an exception. ASP.NET MVC also provides the corresponding wrapper classes (for example, HttpRequestWrapper) which provides a concrete implementation of the base classes in the form of ASP.NET intrinsic object. Other wrapper classes may be defined by third parties in the form of a mock object for testing purpose.           So we can say that a Request object in ASP.NET MVC may be HttpRequestWrapper or may be MockRequestWrapper(assuming that MockRequestWrapper class is used for testing purpose). Here is list of ASP.NET instrinsic and their implementation in ASP.NET MVC in the form of base and wrapper classes. Base Class Wrapper Class ASP.NET Intrinsic Object Description HttpApplicationStateBase HttpApplicationStateWrapper Application HttpApplicationStateBase abstracts the intrinsic Application object HttpBrowserCapabilitiesBase HttpBrowserCapabilitiesWrapper HttpBrowserCapabilities HttpBrowserCapabilitiesBase abstracts the HttpBrowserCapabilities class HttpCachePolicyBase HttpCachePolicyWrapper HttpCachePolicy HttpCachePolicyBase abstracts the HttpCachePolicy class HttpContextBase HttpContextWrapper HttpContext HttpContextBase abstracts the intrinsic HttpContext object HttpFileCollectionBase HttpFileCollectionWrapper HttpFileCollection HttpFileCollectionBase abstracts the HttpFileCollection class HttpPostedFileBase HttpPostedFileWrapper HttpPostedFile HttpPostedFileBase abstracts the HttpPostedFile class HttpRequestBase HttpRequestWrapper Request HttpRequestBase abstracts the intrinsic Request object HttpResponseBase HttpResponseWrapper Response HttpResponseBase abstracts the intrinsic Response object HttpServerUtilityBase HttpServerUtilityWrapper Server HttpServerUtilityBase abstracts the intrinsic Server object HttpSessionStateBase HttpSessionStateWrapper Session HttpSessionStateBase abstracts the intrinsic Session object HttpStaticObjectsCollectionBase HttpStaticObjectsCollectionWrapper HttpStaticObjectsCollection HttpStaticObjectsCollectionBase abstracts the HttpStaticObjectsCollection class      Summary:           ASP.NET MVC provides a set of abstract classes for ASP.NET instrinsic objects in the form of base classes, allowing someone to create their own implementation. In addition, ASP.NET MVC also provide set of concrete classes in the form of wrapper classes. This design really makes application easier to test and even application may replace concrete implementation with thier own implementation, which makes ASP.NET MVC very flexable.

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  • Obama’s win and the geeky stuff behind his success

    - by Gopinath
    Mr. Obama is elected as President of United States for the second term with a great majority. Here are few geeky bytes associated with Mr.Obama’s success and the world records he set up Obama Creates New Records on Twitter and Facebook – Just after winning the race for president, Barak Obama setup world records on Twitter & Facebook. His tweet “Four more years” re-tweeted more than 770K times and his Facebook post received 3.8 million likes. Twitter Kills the Fail Whale, One Tweet at a Time – Twitter handled insane user loads with millions of tweets related to election and proved that it’s platform is now more robust than ever. In a post on the company’s engineering blog, Twitter said people sent 31 million election-related tweets on Tuesday alone. From 8:11 p.m. to 9:11 p.m. P.S.T., Twitter processed an average 9,965 tweets per second, with a one-second peak of 15,107 tweets per second at 8:20 p.m., the company said. Obama’s win a big vindication for Nate Silver, king of the quants – Nate Silver, a statistician and blogger was spot on in predicting Obama’s win many weeks. He did not depend on astrology or surveys to predict Obama’s success. He used big data and statistical analysis to project votes. CNET says “Despite some incredulous political pundits, the FiveThirtyEight statistician appears to have correctly predicted the winner in all 50 states in the presidential election” Inside the Secret World of the Data Crunchers Who Helped Obama Win – Team Obama used big data and analytical systems to win the elections!! Barack Obama Goes On Reddit For Last Campaign Stop Of Political Career – Reditt is getting a lot of Obama’s attention these days. He is quite often stopping by Reditt to say hi to the nerds & geeks hanging out there. His chat with nerds on Reddit has paid rich dividends.

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  • error 503: service unavailable when using apt-get update behind proxy

    - by ubuntu2man
    Hi, I am using a transparent proxy (other box). When I try to do an 'apt-get update' I get these warnings (in german): ... W: Fehlschlag beim Holen von http://security.ubuntu.com/ubuntu/dists/maverick-security/restricted/source/Sources.gz 503 Service Unavailable W: Fehlschlag beim Holen von http://security.ubuntu.com/ubuntu/dists/maverick-security/universe/source/Sources.gz 503 Service Unavailable W: Fehlschlag beim Holen von http://security.ubuntu.com/ubuntu/dists/maverick-security/multiverse/source/Sources.gz 503 Service Unavailable W: Fehlschlag beim Holen von http://security.ubuntu.com/ubuntu/dists/maverick-security/main/binary-i386/Packages.gz 503 Service Unavailable W: Fehlschlag beim Holen von http://security.ubuntu.com/ubuntu/dists/maverick-security/restricted/binary-i386/Packages.gz 503 Service Unavailable W: Fehlschlag beim Holen von http://security.ubuntu.com/ubuntu/dists/maverick-security/universe/binary-i386/Packages.gz 503 Service Unavailable E: Einige Indexdateien konnten nicht heruntergeladen werden, sie wurden ignoriert oder alte an ihrer Stelle benutzt. I changed ~.bashrc: http_proxy=http://192.168.120.199:8080 https_proxy=https://192.168.120:8080 export http_proxy export https_proxy I wrote on commandline: export http_proxy=http://proxyusername:proxypassword@proxyaddress:proxyport sudo apt-get update And I edited /etc/apt/apt.conf: Acquire::http::proxy "http://192.168.120.199:8080/"; Acquire::ftp::proxy "http://192.168.120.199:8080/"; Nothing has worked. Does anyone knows how to make apt-get working through a transparent proxy? Regards, ubuntu2man

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  • Graphic Designers: Fuel Behind a Site?s Success

    The success of a site or say an online business depends on several factors. Not only the products and services that you specialize in coin the success strategy for a business, other factors like prom... [Author: David Jackson - Web Design and Development - August 31, 2009]

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  • A Complete Customer Experience Solution (3 of 3 in 'No Customer Left Behind' Series)

    - by Kathryn Perry
    A guest post by David Vap, Group Vice President, Oracle Applications Product Development In my previous post, I talked about taking three concrete steps to improve your customers' overall experiences: 1) understand your customer, 2) empower your ecosystem, and 3) adapt your business. To do these effectively and efficiently, it's important to find the right technology that can bridge the gaps across your channels, interactions, departments, and repositories. Oracle has spent the past three years and more than six billion dollars acquiring and developing some of the world's best-of-breed applications. The result is the most comprehensive customer experience (CX) portfolio offering in the World - bar none: ATG Best in Class Selling Experiences Fatwire Best in Class Marketing Experiences Inquira Best in Class Support Experiences Endecca Best in Class Search Experiences RightNow Best in Class Service Experiences Vitrue & Involver Best in Class Social Marketing Collective Intellect Best In Class Social Listening We don't expect organizations to eat the CX elephant in one bite, nor should they try to. There are key strategic initiatives within each of the four main pillars of our customer experience offering for which we deliver solutions: 1. Customer Experience for Marketing Social Listening and Engagement Social Marketing Marketing Websites Demand Generation and Lead Management Marketing and Loyalty Management 2. Customer Experience for Commerce Search, Navigation & Content Delivery Cross-Channel Commerce Targeting & Product Recommendations Social Commerce Order Management & Fulfillment Retail Store Operations 3. Customer Experience for Sales Sales Force Automation Social Selling Territory & Quota Management Revenue Forecasting Partner Relationship Management Quote to Cash Incentive Compensation 4. Customer Experience for Service Cross-Channel Customer Service Knowledge Management Social Customer Service Eligibility Management Contracts, Assets, and Entitlements Industry-Specific Solutions eBilling Oracle's customer experience portfolio is socially infused at each layer of our pillars rather than simply bolted on as a side process. This combines with the power of the Cloud to run the parts of the solution that need the access, efficiency, and agility from a managed infrastructure. You can get the compliance control from on-premise backbone infrastructure systems that run your business and don't change that often. Please take advantage of our teams of Oracle customer experience professionals and our key agency and technology partner ecosystem. They can help you develop strategic solution roadmaps that build and deliver customer experience and that are tailored to your business needs and objectives. No one has built a better customer service portfolio to manage the entire customer journey than Oracle. It is backed by CX thought leadership programs, a commitment from our executives, and a worldview that your technology decisions must be driven by your customer experiences to succeed. If you’d like to follow up on this conversation, please leave a comment or contact me at [email protected]. You can get more information on Oracle’s complete customer experience solution here.

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  • Logic behind a bejeweled-like game

    - by Joe
    In a prototype I am doing, there is a minigame similar to bejeweled. Using a grid that is a 2d array (int[,]) how can I go about know when the user formed a match? I only care about horizontally and vertically. Off the top of my head I was thinking I would just look each direction. Something like: int item = grid[x,y]; if(grid[x-1,y]==item) { int step=x; int matches =2; while(grid[step-1,y]==item) { step++; matches++ } if(matches>2) //remove all matching items } else if(grid[x+1,y]==item //.... else if(grid[x,y-1==item) //... else if(grid[x,y+1]==item) //... It seems like there should be a better way. Is there?

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  • FoxTales: Behind the Scenes at Fox Software by Kerry Nietz

    Flash backs from the past! It's truly amazing to discover that software development from freshman to senior level as well as project management hasn't changed that much. Kerry Nietz describes his memoir from his final year at college to his first job at Fox Software to 'an early retirement' at Microsoft. This title also brought his other fictional novels to my attention. Once again here is the review I published on Amazon: Built to last! I have been around in software development for more than a decade now but honestly I have to admit it is only now that I took the opportunity to read about the history of my used to be primary programming language. In fact, I started with Visual FoxPro 6 back in 1999 and went only down to FoxPro for Windows 2.6 during migration projects - long after the stories described in this title. It is really interesting to see how they actually managed to create a great product with such a small team of developers. "Create the best Report Writer in the world, out of only sawdust, bubblegum, and dreams." - That's the best sentence I'm going to quote from this title in the future. An inspiration to achieve the impossible, only by taking small steps. Just begin the journey - one step after the next one. If you fall, stand up and continue to walk. Kerry takes the reader on an amazing trip through almost 4 years working at a small software company in Perrysburg, Ohio. That went from a another 'look-alike' of the mighty Ashton-Tate dBase to the leading force in database development, long before Microsoft Access (project name: Cirrus) was even finished. It survived Borland Paradox and even nowadays Visual FoxPro is still in daily use in thousands of companies world-wide. Actually, I'm glad that I had the chance to foster my programming knowledge with Visual FoxPro. After his excellent work in software development, Kerry went for a second career as a writer. I'm looking forward to read his other titles soon:

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  • tomcat behind apache

    - by dannynjust
    i am trying to use the mod_proxy_ajp to forward all the request from tocat.example.com to example.com:8080 here is what the tomcat server.xml looks like: <Connector port="8009" protocol="AJP/1.3" redirectPort="8443" /> and here is the apache.conf config: <VirtualHost *:80> ServerName tomcat.example.com ServerAdmin [email protected] ErrorLog logs/tomcat.example.com-error_log CustomLog logs/tomcat.example.com-access_log common <Proxy *> AddDefaultCharset Off Order deny,allow Allow from all </Proxy> ProxyPass / ajp://example:8009/ ProxyPassReverse / ajp://example:8009/ </VirtualHost> but it is not working, any idea?

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  • How to learn the math behind the code?

    - by Solomon Wise
    I am a 12 year old who has recently gotten into programming. (Although I know that the number of books you have read does not determine your programming competency or ability, just to paint a "map" of where I am in terms of the content I know...) I've finished the books: Python 3 For Absolute Beginners Pro Python Python Standard Library by Example Beautiful Code Agile Web Development With Rails and am about halfway into Programming Ruby. I have written many small programs (One that finds which files have been updated and deleted in a directory, one that compares multiple players' fantasy baseball value, and some text based games, and many more). Obviously, as I'm not some sort of child prodigy, I can't take a formal Computer Science course until high school. I really want to learn computer science to increase my knowledge about the code, and the how the code runs. I've really become interested in the math part after reading the source code for Python's random module. Is there a place where I can learn CS, or programming math online for free, at a level that would be at least partially understandable to a person my age?

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  • Rationale behind freeware projects

    - by VexXtreme
    I've seen some freeware projects in the past where the author(s) invested a significant amount of their personal time and resources and never even considered charging for the software. A lot of these projects were donation based, and from what I've heard, donationware can never be a viable business model (even to simply support development costs) because most people choose not to donate if given an option. A lot of these projects eventually shut down because their authors could not sustain them further. Granted, some people simply like making the community happy (or something), but if you're struggling to keep your project alive, why not charge some small amount such as $10 simply to stay operational? If people find your software useful (and a lot of people found those projects VERY useful) they won't have a problem paying such a small amount. The question is: if you have a popular app that people like and download in great numbers, why not put a price tag on it? Why do it for free?

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  • The Science Behind Salty Airline Food

    - by Jason Fitzpatrick
    In this collection, Artist Signe Emma combines a scientific overview of the role salt plays in airline food with electron microscope scans of salt crystals arranged to look like the views from an airplane–a rather clever and visually stunning way to deliver the message. Attached to the collection is this explaination of why airlines load their snacks and meals with salt: White noise consists of a random collection of sounds at different frequencies and scientists have demonstrated that it is capable of diminishing the taste of salt. At low-pressure conditions, higher taste and odour thresholds of flavourings are generally observed. At 30.000 feet the cabin humidity drops by 15%, and the lowered air pressure forces bodily fluids upwards. With less humidity, people have less moisture in their throat, which slows the transport of odours to the brains smell and taste receptors. That means that if a meal should taste the same up in the air, as on ground it needs 30% of extra salt. To combat the double assault on our sense of taste, the airlines boost the salt content to compensate. For more neat microscope scans as high-altitude view photographs, hit up the link below. How to Play Classic Arcade Games On Your PC How to Use an Xbox 360 Controller On Your Windows PC Download the Official How-To Geek Trivia App for Windows 8

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  • The technology behind 22can's curiosity

    - by Cameron Scully
    I don't have alot of experience with mobile apps and I definitely don't know much about MMO's but I was wondering what the basic architecture of a game like that would be (understandably some don't consider it a game, but it must use some game theory and implementation). Mainly, how are they able to send/recieve real time feed back of the cube being chipped away by thousands of players on their mobile devices? How is data of the cube's millions of pieces stored and accessed so quickly? Thanks

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  • The Team Behind SQL Saturday 60 In Cleveland

    - by AllenMWhite
    Last July I asked the assembled group at the Ohio North SQL Server Users Group meeting if they'd be interested in putting on a SQL Saturday. Enthusiastically, they said yes! A great group of people came together and met, first monthly, then every other week, and finally every week, taking time from their families to do the things necessary to put together a SQL Saturday event here in Cleveland. Their work has been amazing and any of you attending our event will see what a great job they've all done....(read more)

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  • Mentioning a price for a service behind a free app in App Store

    - by David
    We are making a business service and have created an app to be used as a front-end. The app is free, but the service is not. Due to Apple taking 30% of in-app purchases, our service cannot be bought as an in-app purchase. My question is: Could Apple choose to throw out our app if we mention the price of the service in the description of our app in iTunes or in a help-text in the app? It seems unreasonable that this would cause problems, but the potential consequences to our business could be terrible so I want to make sure.

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  • The Team Behind SQL Saturday 60 In Cleveland

    - by AllenMWhite
    Last July I asked the assembled group at the Ohio North SQL Server Users Group meeting if they'd be interested in putting on a SQL Saturday. Enthusiastically, they said yes! A great group of people came together and met, first monthly, then every other week, and finally every week, taking time from their families to do the things necessary to put together a SQL Saturday event here in Cleveland. Their work has been amazing and any of you attending our event will see what a great job they've all done....(read more)

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