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  • HTTP/1.1 Status Codes 400 and 417, cannot choose which

    - by TheDeadLike
    I have been referred to here that it might be of better help, I've got a processing file which handles the user sent data, before that, however, it compares the input from client to the expected values to ensure no client-side data change. I can say I don't know lot about HTTP status codes, but I have made up some research on it, and to choose which one is the best for unexpected input handling. So I came up with: 400 Bad Request: The request cannot be fulfilled due to bad syntax 417 Expectation Failed: The server cannot meet the requirements of the Expect request-header field Now, I cannot be really sure which one to use, I have seen 400 Bad Request being used alot, however, whatI get from explanation is that the error is due to an unexistent request rather than an illegal input. On the other side 417 Expectation Failed seems to just fit for my use, however, I have never seen or experimented this header status before. I need your experience and opinions, thanks alot! For a full detailed with form/process page drafts, and my experiments, follow this link.

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  • What causes winsock 10055 errors? How should I troubleshoot?

    - by Tom Kerr
    I'm investigating some issues with winsock 10055 errors on a chain of custom applications (some of which we control, some not) and was hoping to get some advice on techniques to troubleshoot the problem. No buffer space available. An operation on a socket could not be performed because the system lacked sufficient buffer space or because a queue was full. From research, non-paged pool and ports seem to be the only resources which can cause this error. Is there another resource which might cause 10055 errors? Currently, we have perfmon counters setup on the applications and non-paged pool usage looks low in most circumstances. Open TCP connections looks low and I am unaware of another way to monitor ports. Since it only happens in production, we are unable to use more invasive counters. Is there some other tool or procedure you would recommend to diagnose which application is causing the issue?

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  • Shell Script Launching Child Processes

    - by Matt James
    Disclaimer: I'm totally new to shell scripting, but have quite a bit of experience in other languages like PHP and Obj-C. I'm writing my first daemon script. Here are the goals: I want it to run in the background I want it to be triggered by an init.d script that includes start/stop/restart commands I want each process in a loop to trigger its own subprocess. When the parent process kicked off by the init.d script is killed, I want the subprocesses to die as well. Essentially, I'm looking for the same kind of behavior that appears to be very common among software like apache, spamd, dovecot, etc. But, based on my research, I haven't found a single, simple answer as to how this kind of thing is achieved. Any help is greatly appreciated.

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  • Confusion over terminology SSH, Shell, Terminal, Command Prompt and Telnet

    - by byronyasgur
    I don't usually use SSH if I can get away with it, but if I have to I do of course, and I've seemingly done this for years while still managing to remain slightly confused about these different terms ... from my basic research, this is my understanding, could someone verify/correct this? Telnet ... before SSH, not secure SSH ... ( secure shell ) the general name of the system/protocol Shell ... short name for SSH Command Line/Command Prompt ... the windows version Terminal ... the Unix version, also used by apple. Two further questions: What is the Linux version commonly called, is it just called SSH ? What is bash ?

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  • One codec to rule them all

    - by AngryHacker
    I am streaming videos in my house via Windows Media Player Streaming, which is basically DLNA. So theoretically any DLNA compliant device can pick up the stream. However, I've quickly found that this is only one part of the solution. Over the years I've accumulated a ton of video-capable devices. While all these devices can see the Windows Media Player stream, they all speak in different codecs. And frankly, I am confused by codecs. In the beginning, I thought that the codecs were defined by the filename extension they carried (e.g. avi, mp4, wmv, etc...), but after further research, it looks like the extensions are simply containers. Inside an .avi file could reside several different codecs. So my question is this: is there a format/codec that plays equally well on any device.

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  • Remotely turn on a device that is powered off?

    - by njboot
    Verbatim from the interview between Brian Williams and Edward Snowden last night: Snowden: Any intelligence service in the world that has significant funding and a real technological research team can own that phone [refering to Williams' iPhone] as soon as it connects to a network; it can be theirs. Williams: Can anyone turn it on remotely if it's off? Snowden: They can absolutely turn it on with the power turned off on the device. I concede Snowden's first point, fine. But the last? Does Snowden's last claim, that a powered off mobile device can be remotely turned, have any merit? It seems highly improbable and seemingly impossible.

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  • Logging Apparently Not Working - Can't Set Configure Replication

    - by square_eyes
    I'm using a tutorial to set up a master (single) slave setup. When I run the command show master status; I get Empty set (0.00 sec). I have done a lot of research and believe that the log file I have set up isn't being used properly. The master is a Windows server, and I am administering it through workbench. The log file (log-bin.log) I have configured in the options exists, and is accessible by 'System'. But when I open it as a text file it doesn't have any data. So I'm assuming it's not getting used properly. How can I get the logging happening so I can finish setting up this replication? Edit: Purely for reference here is the tutorial. I followed all the steps and double checked everything up until show master status.

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  • Running Webapp on Mac in UTC (either changing MacBook timezone or tomcat timezone)

    - by Andy A
    To run my web app, I need to set my timezone to UTC on my MacBook. I can do this temporarily by opening a Konsole and entering sudo ln -sf /usr/share/zoneinfo/UTC /etc/localtime However, my timezone returns to normal when I restart my machine! Any advice? Edit : The response to this question by 'Celada' implies that I can just make my Server UTC. I am using Apache Tomcat 7. Adding to Celada's response, how can I make it UTC? Update - 3rd April : Following Celada's response, I have tried adding SetEnv TZ UTC at the top of startup.sh. This didn't seem to make a difference. After some research, I tried adding export JAVA_OPTS="-Duser.timezone=UTC" to startup.sh, but this too had no effect. Am I adding the correct command to the correct file?

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  • Open Source project that does SSL Inspection

    - by specs
    I've been assigned to research out and spec replacing our old and decrepit http content filtering system. There are several open source filtering packages available but I've not come across one that does SSL inspection. The new system will scale to many branches of different sizes, from say 10 users to a few hundred, so purchasing an appliance for each branch isn't desirable. When we're further along, we will do custom programming as we have a few unique needs in other aspects of filtering, so if the suggestion takes a bit of customization, it won't be a problem.

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  • Machine Learning Algorithm for Predicting Order of Events?

    - by user213060
    Simple machine learning question. Probably numerous ways to solve this: There is an infinite stream of 4 possible events: 'event_1', 'event_2', 'event_4', 'event_4' The events do not come in in completely random order. We will assume that there are some complex patterns to the order that most events come in, and the rest of the events are just random. We do not know the patterns ahead of time though. After each event is received, I want to predict what the next event will be based on the order that events have come in in the past. The predictor will then be told what the next event actually was: Predictor=new_predictor() prev_event=False while True: event=get_event() if prev_event is not False: Predictor.last_event_was(prev_event) predicted_event=Predictor.predict_next_event(event) The question arises of how long of a history that the predictor should maintain, since maintaining infinite history will not be possible. I'll leave this up to you to answer. The answer can't be infinte though for practicality. So I believe that the predictions will have to be done with some kind of rolling history. Adding a new event and expiring an old event should therefore be rather efficient, and not require rebuilding the entire predictor model, for example. Specific code, instead of research papers, would add for me immense value to your responses. Python or C libraries are nice, but anything will do. Thanks! Update: And what if more than one event can happen simultaneously on each round. Does that change the solution?

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  • Are Motherboards for the Acer Aspire One AOA150 Netbook Compatible with the AOA110?

    - by Mindstormscreator
    I have an Acer Aspire One ZG5 AOA110-1588 netbook, and the motherboard doesn't have a port for a SATA 2.5 inch hard drive; it only supports this slow 8GB SSD type drive. Through research I've discovered that the AOA150 motherboards do have a SATA slot, and the bottom plate of these laptops have an appropriate protrusion for the drive to fit in (for example, compare this to this). The AOA110 and AOA150 models are very similar in appearance and specs. I've even seen tutorials that involve soldering a SATA connector onto the AOA110's motherboard, essentially creating an AOA150 motherboard (right?) So, could I just swap out the motherboard in my netbook with the MBS0506001? (I'd post another link to the actual board but can't because of the spam prevention...) I assume I would also need to purchase and replace the bottom cover with a larger one and possibly get a hard drive caddy as well...? Thanks!

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  • On boot firmware request for intel GMA 3100 chipset timing out

    - by Yannick M.
    I am currently in the process of installing a Gentoo linux box with a Vanilla 2.6.29-r5 kernel with gentoo-xen-kernel patches in order to run the Xen Hypervisor. After rebooting with the new kernel, the booting process seemed to hang on: [ 0.863005] platform microcode: firmware: requesting intel-ucode/06-0f-07 [ 60.863442] Microcode Update Driver: v2.00-xen <[email protected]>, Peter Oruba Apparently the firmware request times out after 60 seconds (/sys/class/firmware/timeout) and booting just continues. I have done some research and have found that on RHEL-4 this problem was related to the mount of /sys changed and the firmware.agent hotplug script couldn't parse the line correctly. However I am having some difficulty tracking down how to fix this on Gentoo. Any and all ideas are greatly appreciated! Thanks

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  • Experience migrating legacy Cobol/PL1 to Java

    - by MadMurf
    ORIGINAL Q: I'm wondering if anyone has had experience of migrating a large Cobol/PL1 codebase to Java? How automated was the process and how maintainable was the output? How did the move from transactional to OO work out? Any lessons learned along the way or resources/white papers that may be of benefit would be appreciated. EDIT 7/7: Certainly the NACA approach is interesting, the ability to continue making your BAU changes to the COBOL code right up to the point of releasing the JAVA version has merit for any organization. The argument for procedural Java in the same layout as the COBOL to give the coders a sense of comfort while familiarizing with the Java language is a valid argument for a large organisation with a large code base. As @Didier points out the $3mil annual saving gives scope for generous padding on any BAU changes going forward to refactor the code on an ongoing basis. As he puts it if you care about your people you find a way to keep them happy while gradually challenging them. The problem as I see it with the suggestion from @duffymo to Best to try and really understand the problem at its roots and re-express it as an object-oriented system is that if you have any BAU changes ongoing then during the LONG project lifetime of coding your new OO system you end up coding & testing changes on the double. That is a major benefit of the NACA approach. I've had some experience of migrating Client-Server applications to a web implementation and this was one of the major issues we encountered, constantly shifting requirements due to BAU changes. It made PM & scheduling a real challenge. Thanks to @hhafez who's experience is nicely put as "similar but slightly different" and has had a reasonably satisfactory experience of an automatic code migration from Ada to Java. Thanks @Didier for contributing, I'm still studying your approach and if I have any Q's I'll drop you a line.

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  • Location of truetype fonts

    - by StackedCrooked
    I would like to create a small script that installs a few truetype fonts on the user's system. On my Ubuntu machine the truetype fonts are located at /usr/share/fonts/truetype. However, I'm not sure if this location is the same on all machines. Is there a way to find out where truetypes fonts are stored on any Linux system? Update After some research I found that the path usr/share/fonts/truetype is specified in the XML file /etc/fonts/fonts.conf. It's an XML file, so I can use XPath to get the dir: xpath -q -e 'fontconfig/dir[1]/text()[1]' /etc/fonts/fonts.conf I don't know however if this file will exist on all (or most) Linux systems.

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  • Survey of project-administration experience [on hold]

    - by Salvador Beltrán
    My name is Salvador, I'm a Computer System Eng. Student and I'm searching for people to contribute with my research and I need real opinions - Experience (is an investigation for problems in the Project Management Area), just to be clear it can be any kind of project. If you help me with these 3 questions I would appreciate you so much! :) 1 - Any kind of problem that ocurred during the process of the project administration(Just the description). 2 - What was the impact? 3 - And what was the solution to avoid this problem in some future. 4 - What do you do(Software Engineering,Networking,etc). Thank you very much!

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  • Mathematical annotations in a PDF file

    - by kvaruni
    I like to annotate papers I read in a digital way. Numerous programs exist to help in this process. For example, on OS X one can use programs such as Skim or even Preview. However, making annotations is dreadful when one wishes to add mathematical annotations, such as formulas or greek letters. A cumbersome "solution" is to select the desired symbol one by one using the Special Characters palette, though this considerably slows down the annotation process. Is there any way to add mathematical annotations to a PDF? The only two limitations that I would impose on a solution is that 1) the mathematical text needs to be selectable, i.e. it must be text and 2) I want to limit the number of programs I need to make the process as painless as possible. Some of the more promising solutions I have tried include generating LaTeX with LaTeXiT, but it seems to be impossible to add a PDF on top of another PDF. Another attempt was to use jsMath to generate the symbols and copy-paste these as annotation using one of the jsMath fonts. This results in unreadable, incorrect characters.

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  • Flash Player Automatic Updater on Windows Startup

    - by Mikee
    Hi all, Adobe Flash Player is set to automatically check for updates on Windows startup. I've always wondered where exactly it is set to do this. Checking the running services, as well as msconfig does not yield its location. The message in question looks like this: http://www.technipages.com/disable-an-update-to-your-adobe-flash-player-is-available-message-forever.html I know how to disable it via Adobe's web site (instructions are included in link above), but I'm interested in knowing where exactly in Windows is this set to perform this action? I have done some research on this, and people keep saying to check the following registry locations: HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\RunOnce or the HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Run However, I have checked those locations, and I still cannot locate where this updater is stored. I'm pretty sure that malware also uses this technique to automatically load upon startup, and since it's not in the typical location(s) that a user would look, it's well hidden. Thank you for the assistance!

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  • Ubuntu 9.0.4 Presario S4000NX Fan Speed

    - by Chris C
    I recently install Ubuntu 9.0.4 on a Presario S4000NX and the CPU fan speed is kept at max. With Windows XP installed the fan speed would increase/decrease as required. I've tried to install lm-sensors and run the sensors-detect. It recommended that I load the modules which I did: smsc47m192 i2c-i801 When running sensor-detect it gave me this strange message: Trying family SMSC Found SMSC LPC47M15x/192/997 Super IO Fan Sensors (but not activated) Running the sensors command gives me a list of voltages and CPU and temperature but doesn't list any fans. After doing some Internet research I then tried to load the smsc47m1 module but I get the following error: FATAL: Error inserting smsc47m1 (/lib/modules/2.6.28-15-generic/kernel/drivers/hwmon/smsc47m1.ko): no such device The file smsc47m1.ko does exist in the listed folder. Any suggestions for getting the fan speed (and the noise) down in Ubuntu? Thanx. - Chris P.S. - I would have put better tags but Server Fault wouldn't let me.

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  • Storing URLs while Spidering

    - by itemio
    I created a little web spider in python which I'm using to collect URLs. I'm not interested in the content. Right now I'm keeping all the visited URLs in a set in memory, because I don't want my spider to visit URLs twice. Of course that's a very limited way of accomplishing this. So what's the best way to keep track of my visited URLs? Should I use a database? * which one? MySQL, sqlite, postgre? * how should I save the URLs? As a primary key trying to insert every URL before visiting it? Or should I write them to a file? * one file? * multiple files? how should I design the file-structure? I'm sure there are books and a lot of papers on this or similar topics. Can you give me some advice what I should read?

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  • JQuery/JavaScript confusion with Previous and Next buttons.

    - by Anders H
    I've got some inherited JQuery code that isn't working as I'd think and I'm just not even sure what to research or look up next. The Problem: I've got a few DIVs within the HTML: a container, a "frame" and the content. If the content is longer than the frame, it's cut off using overflow:hidden and a Next - button appears. The next button works correctly. However, there's also a previous button with similar code, but it does not work as expected and just displays whenever the next button does. Whenever either button is hidden, it will not reappear again when navigating back through the "pages". When the I may be overlooking something in the code, but here it is in full. The HTML: <div id="draggable" class="ui-widget-content"> <div id="draggable-title" class="cufon">about</div> <a id="draggable-close" href="javascript:void(0);"><div class="close-img icon"></div></a> <div class="clear"></div> <div id="draggable-frame"> <div id="draggable-content"> </div> </div> <a id="prevContent" href="javascript:void(0);">&laquo; previous</a><a id="nextContent" href="javascript:void(0);">next &raquo;</a> </div> The JavaScript: $(function() { $("#draggable").draggable(); }); $(document).ready(function(){ $("#draggable-frame").scrollTop(0); $("#prevContent").click(function(){ $("#draggable-content").fadeOut("medium"); setTimeout("showPrev()", 250); if($("#draggable-frame").scrollTop()+$("#draggable-frame").height() >= $("#draggable-content").height()) { $("#prevContent").hide(); } $("#draggable-content").fadeIn("medium"); }); $("#nextContent").click(function(){ $("#draggable-content").fadeOut("medium"); setTimeout("showNext()", 250); if($("#draggable-frame").scrollTop()+$("#draggable-frame").height() >= $("#draggable-content").height()) { $("#nextContent").hide(); } $("#draggable-content").fadeIn("medium"); }); $("#draggable-close").click(function(){ $("#draggable").fadeOut("medium"); }); $("#prevContent").hide(); $("#nextContent").hide(); showContent("about"); $(".opener").click(function(){ $("#draggable-frame").scrollTop(0); $("#draggable").fadeIn("medium"); showContent($(this).attr("title")); }); }); // function showPrev() { $("#draggable-frame").scrollTop($("#draggable-frame").scrollTop() - $("#draggable-frame").height()); } // function showNext() { $("#draggable-frame").scrollTop($("#draggable-frame").scrollTop() + $("#draggable-frame").height()); } function showContent(title) { $("#draggable-title").html(title); $("#draggable-content").html($("#"+title).html()); Cufon.replace('.cufon', { fontFamily: 'cav', hover: true }); $("#nextContent").hide(); $("#prevContent").hide(); if($("#draggable-content").height() > $("#draggable-frame").height()) { $("#nextContent").show(); } if($("#draggable-content").height() > $("#draggable-frame").height()) { $("#prevContent").show(); } } Even just point me in the right direction to research would be a big help right now. Thank you.

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  • Installing and maintaining an email server

    - by Andrew
    I need to move hosting providers for four or five domains and for several reasons I'm considering a Linux VPS rather than staying with my current shared, managed hosting provider. The only thing that's stopping me is email. I have lots of experience running and maintaining Apache, but none with email servers. Based on some research, if I want to keep what I've using now, it looks like I'd be going with Postfix and Dovecot, and probably Exim and SpamAssassin. I have no problem performing regular maintenance and watching for security updates, but I don't want to bite off more than I can chew. For someone new to email services, how hard is it to set up an email server that is externally accessible (via SMTP and POP3, not IMAP), available over SSL/TLS and reasonably reliable for multiple domains? How much of a time commitment is it to maintain one?

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  • How to safely remove a device blocked by the System process with a handle on \$Extend\$RmMetadata\$Txf

    - by Heinzi
    I have an external HDD which I would like to "safely remove". Unfortunately, my system (Windows 7 x64) complains that "the device is currently in use". Using Process Explorer I discovered which process is holding a handle on the device: Obviously, System is not a process that I can just kill and be done with it. I've done a bit of research and this seems to be a common problem, but no solution has been found so far (except for rebooting the machine, which I'd like to avoid if possible). Is there any solution to this problem that I've missed?

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  • Single Sign On for WebServices, WCS, WFS, WMS (Geoserver), etc.

    - by lajuette
    I'm trying to implement a Single Sign On (SSO) for a web application. Maybe you can help me find a proper solution, give me a direction or tell me, that solutions already exist. The scenario: A GeoExt (ExtJS for geodata/map based apps) webapp (JavaScript only) has a login form to let the user authenticate himself. The authentication is not implemented yet, so i'm flexible with respect to that. After authenticating to the main webapp the user indirectly accesses multiple 3rd-party services like WebServices, GeoServer WFS, Google Maps, etc. These services might require additional authentication like credentials or keys. We are (so far) not talking about additional login screens, just some kind of "machine to machine"-authentication. The main problem: I'm unable to modify the 3rd party services (e.g. Google) to add a SSO mechanism. I'd like to have a solution that allows the user to log in once to have access to all the services required. My first idea was a repository that stores all the required credentials or keys. The user logs in and can retrieve all required information to acces sthe other services. Does anybody know of existing implementations, papers, maybe implementations of such services? Other requirements: The communication between the JS application and the repository must be secure. The credentials must be stored in a secure manner. But the JS app must be able to use them to access the services (no chance to store a decryption key in a JS-app securely, eh? *g).

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  • App pool gets stuck on reset and takes .net pages out

    - by delenda
    Several times after our app pool has been told to reset, it gets stuck, the .net pages go down and the following error appears in the application event log: Failed to execute request because the App-Domain could not be created. Error: 0x80070057 The parameter is incorrect. Our app pool is scheduled to automatically reset at 4am, so the errors stay up until we manually restart the app pool. Has anyone else encountered the error or know of any solutions? Research has suggested it's a permissions issue, but the permissions don't change and the error happens infrequently. The site has no other permission based problems and the app pool identity has permission where needed.

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  • Changing memory allocator to Jemalloc Centos 6

    - by Brian Lovett
    After reading this blog post about the impact of memory allocators like jemalloc on highly threaded applications, I wanted to test things on a larger scale on some of our cluster of servers. We run sphinx, and apache using threads, and on 24 core machines. Installing jemalloc was simple enough. We are running Centos 6, so yum install jemalloc jemalloc-devel did the trick. My question is, how do we change everything on the system over to using jemalloc instead of the default malloc built into Centos. Research pointed me at this as a potential option: LD_PRELOAD=$LD_PRELOAD:/usr/lib64/libjemalloc.so.1 Would this be sufficient to get everything using jemalloc?

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