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  • Why do I get different openssl versions?

    - by CoCoMonk
    I'm trying to check if I have the latest OpenSSL, my main concern in the heartbleed bug. I tried 2 commands: openssl version yum info openssl openssl version output OpenSSL 1.0.1e-fips 11 Feb 2013 yum info openssl output Installed Packages Name : openssl Arch : x86_64 Version : 1.0.1e Release : 16.el6_5.14 ... I have a couple of questions: Why do I get different versions from these 2 commands? How do I check the heartbleed vulnerability without having the 443 port open?

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  • Why internet is said to be untrusted network?

    - by Ant's
    From wikipedia : 2 In computer security, a DMZ (sometimes referred to as a perimeter networking) is a physical or logical subnetwork that contains and exposes an organization's external services to a larger untrusted network, usually the Internet. Why it says larger untrusted network, usually the Internet. I see it many places that internet is said to be untrusted network. Are there any reason for it?

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  • Why is Windows 7 not following all routes?

    - by GigabyteProductions
    My computer is connected to my secondary router that's running the 192.168.42.0/24 network and my computer also has a route that directs anything on that network to the router, but for anything on that network other than the router itself, it get's the ICMP response of Reply from 192.168.42.194: Destination host unreachable. (with 192.168.42.194 being my computer). Every other network works, like all of the internet, or addresses on my primary router like 192.168.1.*, just not on the 192.168.42.0/24 network... route print returns: IPv4 Route Table =========================================================================== Active Routes: Network Destination Netmask Gateway Interface Metric 0.0.0.0 0.0.0.0 192.168.42.1 192.168.42.194 276 127.0.0.0 255.0.0.0 On-link 127.0.0.1 306 127.0.0.1 255.255.255.255 On-link 127.0.0.1 306 127.255.255.255 255.255.255.255 On-link 127.0.0.1 306 192.168.42.0 255.255.255.0 On-link 192.168.42.194 276 192.168.42.194 255.255.255.255 On-link 192.168.42.194 276 192.168.42.255 255.255.255.255 On-link 192.168.42.194 276 224.0.0.0 240.0.0.0 On-link 127.0.0.1 306 224.0.0.0 240.0.0.0 On-link 192.168.42.194 276 255.255.255.255 255.255.255.255 On-link 127.0.0.1 306 255.255.255.255 255.255.255.255 On-link 192.168.42.194 276 =========================================================================== Persistent Routes: Network Address Netmask Gateway Address Metric 0.0.0.0 0.0.0.0 192.168.42.1 Default =========================================================================== The only time anything is supposed to send an ICMP Host Unreachable response is when there's no route to it, right? So, why is my own computer sending that to ping or tracert when I have the route of 192.168.42.0 with the mask of 255.255.255.0? An IP address of 192.168.42.2 surely fits into that route. If I explicitly add a route for the IP address i am trying to access, it works, like: route add 192.168.42.2 mask 255.255.255.255 192.168.42.1 (the 192.168.42.1 right after mask is gateway, or the device to send the packet to so it can route it further), but why wont it work for the implicit route that's automatically on the table? I disabled my firewall, too (I use Comodo if anyone thinks this still serves as a problem). I'v even tried explicitly adding the gateway of 192.168.42.1 to the 192.168.42.0/24 route instead of it routing through 0.0.0.0's gateway, which is what On-link does. but that didn't work either, so it's not a gateway specification problem. If the host was really unreachable, it would be the router's IP address (192.168.42.1) sending that to me... This network is all of my creation, so there's no problem such as an administrator locking me out, because i am the administrator.

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  • why is nautilus slow?

    - by Coding District
    I'm wondering why Nautilus is very slow when opening a directory containing lots of files. My /usr/lib dir for example has 1900 files and it takes approximately 5+ seconds to show everything. It has been like this since I installed Ubuntu few months ago and it's really quite annoying sometimes. I don't have powerful hardware but I know that Windows Explorer is so much faster than this. Is there anything that can be done to speed it up? Ubuntu 10.04

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  • I dont understand why [closed]

    - by gcc
    I dont understand why they vote down my question ,I couldont understand them -they do know nothing ,donot try to solve it-but they do vote down.If you do know nothing , dont fuck something or dont try to mess up

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  • Why should I use a puppet parametrized class?

    - by robbyt
    Generally when working with complex puppet modules, I will set variables at the node level or inside a class. e.g., node 'foo.com' { $file_owner = "larry" include bar } class bar { $file_name = "larry.txt" include do_stuff } class do_stuff { file { $file_name: ensure => file, owner => $file_owner, } } How/when/why does parametrized classes help when this situation? How are you using parametrized classes to structure your puppet modules?

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  • Why is this code invalid in C#?

    - by mmattax
    The following code will not compile: string foo = "bar"; Object o = foo == null ? DBNull.Value : foo; I get: Error 1 Type of conditional expression cannot be determined because there is no implicit conversion between 'System.DBNull' and 'string' To fix this, I must do something like this: string foo = "bar"; Object o = foo == null ? DBNull.Value : (Object)foo; This cast seems pointless as this is certainly legal: string foo = "bar"; Object o = foo == null ? "gork" : foo; It seems to me that when the ternary branches are of different types, the compiler will not autobox the values to the type object...but when they are of the same type then the autoboxing is automatic. In my mind the first statement should be legal... Can anyone describe why the compiler does not allow this and why the designers of C# chose to do this? I believe this is legal in Java...Though I have not verified this. Thanks. EDIT: I am asking for an understanding of why Java and C# handle this differently, what is going on underneath the scenes in C# that make this invalid. I know how to use ternary, and am not looking for a "better way" to code the examples. I understand the rules of ternary in C#, but I want to know WHY... EDIT (Jon Skeet): Removed "autoboxing" tag as no boxing is involved in this question.

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  • in haskell, why do I need to specify type constraints, why can't the compiler figure them out?

    - by Steve
    Consider the function, add a b = a + b This works: *Main> add 1 2 3 However, if I add a type signature specifying that I want to add things of the same type: add :: a -> a -> a add a b = a + b I get an error: test.hs:3:10: Could not deduce (Num a) from the context () arising from a use of `+' at test.hs:3:10-14 Possible fix: add (Num a) to the context of the type signature for `add' In the expression: a + b In the definition of `add': add a b = a + b So GHC clearly can deduce that I need the Num type constraint, since it just told me: add :: Num a => a -> a -> a add a b = a + b Works. Why does GHC require me to add the type constraint? If I'm doing generic programming, why can't it just work for anything that knows how to use the + operator? In C++ template programming, you can do this easily: #include <string> #include <cstdio> using namespace std; template<typename T> T add(T a, T b) { return a + b; } int main() { printf("%d, %f, %s\n", add(1, 2), add(1.0, 3.4), add(string("foo"), string("bar")).c_str()); return 0; } The compiler figures out the types of the arguments to add and generates a version of the function for that type. There seems to be a fundamental difference in Haskell's approach, can you describe it, and discuss the trade-offs? It seems to me like it would be resolved if GHC simply filled in the type constraint for me, since it obviously decided it was needed. Still, why the type constraint at all? Why not just compile successfully as long as the function is only used in a valid context where the arguments are in Num? Thank you.

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  • What does the Spring framework do? Should I use it? Why or why not?

    - by sangfroid
    So, I'm starting a brand-new project in Java, and am considering using Spring. Why am I considering Spring? Because lots of people tell me I should use Spring! Seriously, any time I've tried to get people to explain what exactly Spring is or what it does, they can never give me a straight answer. I've checked the intros on the SpringSource site, and they're either really complicated or really tutorial-focused, and none of them give me a good idea of why I should be using it, or how it will make my life easier. Sometimes people throw around the term "dependency injection", which just confuses me even more, because I think I have a different understanding of what that term means. Anyway, here's a little about my background and my app : Been developing in Java for a while, doing back-end web development. Yes, I do a ton of unit testing. To facilitate this, I typically make (at least) two versions of a method : one that uses instance variables, and one that only uses variables that are passed in to the method. The one that uses instance variables calls the other one, supplying the instance variables. When it comes time to unit test, I use Mockito to mock up the objects and then make calls to the method that doesn't use instance variables. This is what I've always understood "dependency injection" to be. My app is pretty simple, from a CS perspective. Small project, 1-2 developers to start with. Mostly CRUD-type operations with a a bunch of search thrown in. Basically a bunch of RESTful web services, plus a web front-end and then eventually some mobile clients. I'm thinking of doing the front-end in straight HTML/CSS/JS/JQuery, so no real plans to use JSP. Using Hibernate as an ORM, and Jersey to implement the webservices. I've already started coding, and am really eager to get a demo out there that I can shop around and see if anyone wants to invest. So obviously time is of the essence. I understand Spring has quite the learning curve, plus it looks like it necessitates a whole bunch of XML configuration, which I typically try to avoid like the plague. But if it can make my life easier and (especially) if make it can make development and testing faster, I'm willing to bite the bullet and learn Spring. So please. Educate me. Should I use Spring? Why or why not?

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  • why does chkdsk always report errors on a bad shutdown

    - by rep_movsd
    Once in a while, Windows XP hangs on my laptop (usually when going into standby or hibernate and occasionally on startup) and I have to forcefully poweroff. Ususally chkdsk never runs automatically (I thought it should know that the partitions have nit been unmounted and do that). I religiously run chkdsk without /F after bad shutdowns like this, and invariably it reports that the drive has unfixed errors and must be checked with /F and I do that, and more often than not, the chdsk that runs on startup does not report fixing anything. I have had times in the past (and not only just on this system) when not running chkdsk leads to some strange errors like files not opening even though they exist and inability to save certain files, so I make it a point to always chkdsk after bad shutdown. I never understood why this is : Isnt the whole point of a journalling filesystem like NTFS to avoid file system corruption and endless chkdsks? I even tried once disabling write caching to see if it made any difference, but to no avail....

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  • Why won't the floppy mount?

    - by dboarman-FissureStudios
    The 1.44Meg floppy won't mount in my Nautilus file browser. When I try to mount it, it says there is no media in the drive. Yet, I can write to the floppy through the terminal using the 'cp' command. I can enter the command: mount -t ext2 /floppy and it mounts. I have also run a check and the disk itself is 100% clean. So, why can't I get the nautilus browser to open up the floppy? Is there a way to see the actual floppy from the terminal?

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  • Why does Windows spooler require an administrator account?

    - by Software Monkey
    Does anyone know what changes I might need to make to allow restricted users to print using a printer configured for spooling? My Windows XP SP3 system currently requires me to use an Admin account for printing if the printer is configured to spool documents before printing. If the printer is configured for direct printing it works for all accounts. This used to work and some months back it just stopped, and I can't pin down why. The printer, which is an HP PSC 1200 (an old printer) itself is configured for Everyone to have Print authority and my specific (restricted) account to have Full authority, that is Print, Manage Printers and Manager Documents. My HDD is locked down for restricted users given them only read authority to the entire file system except their data directories, which is how I have run my systems for years. I assume there may be a directory somewhere that I need to allow users to write to.

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  • Why won't SSI work in IIS?

    - by Josh Kodroff
    I can't get IIS to respect my SSI directives - it just outputs the #include directive as if it were regular old html. Here's the relevant data points: My file with the include directive is called index.html This is my directive: <!-- #include file = "header.shtml" --> (it doesn't work with virtual either.) The file being requested is in the same directory as the file being #include-ed. The SSI module is installed. The SSINC-shtml handler mapping is present and enabled. I think it might be some sort of permissions issue (read/write/execute), but I don't know where those settings are in IIS 7.5.

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  • Why can't windows see mmcblk0p3? [closed]

    - by jacknad
    The partition is created on the embedded linux target like this # n - new # p - partition # 3 - partition 3 # 66 - starting cylinder # <blank> - maximum size for the ending cylinder # t - set file system type # 3 - partition 3 # c - set to windows vfat # w - write partition table and exit echo -e "n\np\n3\n66\n\nt\n3\nc\nw" | fdisk /dev/mmcblk0 The file system is then formatted on the embedded linux target as MS-DOS like this # -n volume-name # -F FAT-size mkfs.vfat -n DB -F 32 /dev/mmcblk0p3 A linux host can mount and access files in mmcblk0p3 without issue. Why can't windows? Edit: Although the default number of FATS is 2 I tried adding -f 2 [number-of-FATs] since this is actually being done by busybox on an embedded platform but this didn't help. I understand the Linux MS-DOS file system does not support more than 2 FATs but there are only 2 on this target (the boot is also FAT which is visible), along with and EXT3 (on p2) for the root file system.

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  • Can't connect to my FTP server, why?

    - by Joseph
    I have a windows 2008 server running with FTP 7 on IIS 7. I have it configured to connect as it is out of the box, with a particular user (lets say john) with read/write access. When I use my FileZilla client software, I can connect to the server as john just fine. No problems at all. However, when I try to connect using Windows Explorer or using the cmd prompt I get stone walled, saying "Login failed". My client machine is Windows Vista Ultimate. Does anyone know what might be causing this?

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  • Why is music tagging software so inconsistent?

    - by Billy ONeal
    Hello :) A few years ago I spent an insane amount of time using the excellent Tag&Rename program. However, I find that for random, inexplicable reasons, some music tools simply disregard my tags, and drop or destroy the album art, or have strange handling around some characters. For example, "AC/DC" is poorly handled by most music players when I use Tag&Rename to write the tags. Is there a piece of software that works like Tag&Rename but is more compatible, or is there a way to ensure Tag&Rename writes more compatible tags?

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  • Why does this PowerShell script hang?

    - by jshin47
    Today I had to use Start-Sleep many times so I thought I would create a shortcut function for it, sleep($time). However, whenever I entered the function it never exits! It must be an issue with either the data type for the argument for Start-Sleep or the way I am declaring the function. Instead of posting the whole script, I've posted this useless one that would make a familiar beep pattern if it worked: function beep { Write-Host `a } function sleep { param([int]$time) Start-Sleep -m $time } beep sleep(300) beep sleep(200) beep sleep(50) beep sleep(300) beep sleep(450) beep sleep(200) beep

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  • Why can't I use %USERPROFILE% in %PATH%?

    - by Zano
    On my Windows 7 machine, using the System Properties Environment Variables tool, I try to add %USERPROFILE%\Bin to the system variable PATH. For some reason, that doesn't work, even though %SystemRoot%\system32 works fine. When I try to run commands from the console, files in my Bin folder are not found, even though files in the System32 folder are found. The only difference between UserProfile and SystemRoot that I can see is that the former is a user variable while the latter is a system variable. I i write echo %USERPROFILE%\Bin it yields c:\Users\zano, and if I add c:\Users\zano\Bin explicitly, everything work fine. What's the problem here?

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  • why use branches in svn?

    - by ajsie
    i know that you could organize your files according to this structure in svn: trunk branches tags that you copy the trunk to a folder in branches if you want to have a seperate development line. later on you merge this branch back to trunk. but i wonder why me and my group should do this. why should one copy the trunk to a branch and work with this copy just to merge it back to the trunk, and mean while the code is frequently updated/commited to stay in sync with the trunk. why not just work with the trunk then? what is the benefits with creating a branch? would be great if someone could shed a light on this topic. thanks in advance

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  • Why Do Browsers Leak Memory?

    - by Dane Balia
    A colleague and I were speaking about browsers (using browser control in a project), and it appears as plain as day that all browsers (Firefox, Chrome, IE, Opera) display the same characteristic or side-effect from their usage and that being 'Leaking Memory'. Can someone explain why that is the case? Surely as with any form of code, there should be proper garbage collection? PS. I've read about some defensive patterns on why this can happen from a developer's perspective. I am aware of an article Crockford wrote on IE; but why is the problem symptomatic of every browser? Thanks

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  • Why not standard Android emulators?

    - by Gerry
    I'm new to Android, but have published iphone and bberry apps. I see that I have to create an emulator using the SDK, before I can write and test an app. Why are there no default emulators? Why not at least a Nexus one, or HTC hero emulator shipped with the product? Sure its supposed to be flexible, but why not make it easy to create hello world and play around with a virtual Android phone? Both blackberry and iphone come with default simulators when you download the sdk. Thanks, Gerry

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  • Why is VB so popular? [closed]

    - by aaaidan
    To me, Visual Basic seems clumsy, ugly, error-prone, and difficult to read. I'll let others explain why. While VB.net has clearly been a huge leap forward for the language in terms of features, I still don't understand why anyone would choose to code in VB over, say, C#. However, I still see (what seems to be) the vast majority of commercial web apps from "MS shops" are built in VB. I could stand corrected on this, but VB still seems more popular than it deserves. Can anyone help answer any (or all) of these questions: Am I missing something with VB? Is it easier to learn, or "friendlier" than C#? Are there features I don't know about? Why is VB/VB.net so frequently used today, especially in web projects?

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