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• Kiosk Mode Coding in Chromium

  - by Aaron

  I don't know how easy this would be, since I don't know anything about it, but I need an Ubuntu setup where the machine boots up, displays the login for a few seconds allowing a chance to log in as an admin, and then precedes to automatically log in to a user account which directly opens Chromium (any other browser is acceptable) in a kiosk mode where only the web content is visible, all Chromium keyboard shortcuts are disabled, and all but a select few websites are blocked, redirecting back to the home page after an "Unauthorized web page" warning comes up if the URL constraint is violated. Is it possible to code a kiosk setup like this, or am I asking for too much? If I'm simply uninformed, and there is already much documentation on anything like this, please redirect me to an appropriate page. If you can code or set up something like my description, please reply with step-by-step instructions, and instructions on how to modify the elements of the kiosk mode. Thank you in advance for any help. (Note: I'm currently using Ubuntu 10.04, but any distribution would work.)

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• Easiest solution to setup payments for a conference registration page?

  - by Keith G

  I've got a fair amount of website development experience, but I've been asked to setup a conference registration page in short order. However, I have absolutely zero experience with shopping carts, payment processing, etc. What is the absolutely quickest and easiest way to get this thing up and running? Here are my criteria: Site is currently hosted on Godaddy.com and someone has suggested using their QuickCart We cannot use any option that visits the paypal.com domain because it has been blocked my a large segment of the potential audience (on a military base). Need a $0 option for speakers Cancellations can be accepted, so maybe something that could handle that would be a bonus There is no "product" other than a confirmation that they have registered for the conference.

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• Thread problem updating Windows Forms control in XNA C#

  - by Luis

  I'm development a network card game, and for now i've two players connected but there is a problem with one of them, this one can't do anything on the game. Looks that screen was blocked. I'm think that is because a code i used before. That code is: if (InvokeRequired) { this.Invoke(new MethodInvoker(delegate { ... })); return; } The code above is surrounding code to changing Button values, make connection with server and create game window. Without this code a warning is shown. InvalidOperationException was unhandled Cross-thread operation not valid: Control 'startGameButton' accessed from a thread other than the thread it was created on.

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• Pixel Collision - Detecting corners

  - by Milkboat

  How would I go about detecting the corners of a texture when I use pixel collision detection? I read about corner collision with rectangles, but I am unsure how to adapt it to my situation. Right now my map is tile based and I do rectangular collision until the player is intersecting with a blocked tile, then I switch to pixel collision. The effect I would like to achieve is when the player hits the corner of an object to push him around the side so he doesn't just hit the edge and stop. Any ideas?

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• Website misclassified by websense

  - by Jeff Atwood

  I received the following email from a user of one of our websites: This morning I tried to log into example.com and I was blocked by websense at work because it is considered a "social networking" site or something. I assume the websense filter is maintained by a central location, so I'm hoping that by letting you guys know you can get it unblocked. per Wikipedia, Websense is web filtering or Internet content-control software. This means one (or more) of our sites is being miscategorized by websense as "social networking" and thus disallowed for access at any workplace that uses websense to control what websites their users can and cannot access during work hours. (I know, they are monsters!) How do we dispute this websense classification error, as our websites should generally be considered "information technology" and never "social networking"? How do we know what category websense has put our sites in, so we can pro-actively make sure they're not wrong?

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• copy files without root permission

  - by Akhil Pm

  sir, in my college we have only little permission to use files.i need to copy some C programs from other users to my account. i cannot copy it to "tmp" directory and then copy it back to my account from there. because cp and mv commands are blocked here when copy something to tmp we cannot even have the read permission in it. can you please give a good solution for this. Please i need a solution immediately. (please send it to [email protected]) thanks akhil p m

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• CMS for Blog site

  - by Yau Leung

  I would like to create a blog site with features like Engadget. The editor can upload blog and albums while users can comment. I know it's even easier to use blogspot but it's blocked in China. I have tried Joomla before. It seems a bit slow even after removing most of the modules and the memcache plugin doesn't help much either. Is there any other option? Do I need other plugins to run WordPress as blog?

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• HTTP 303 redirection and robots.txt

  - by Ian Dickinson

  On a site I'm working on, we're using the HTTP 303 redirect pattern (see this article for background) to distinguish between information and non-information resources. So: some URL's under /id get redirected to dynamically-created pages under /doc. These dynamic pages are built from a database, and contain links to other /doc/ resources, so in general we don't want them to be crawled. Our robots.txt contains: Disallow: /doc However, we do want the non-redirected pages under /id to get indexed by Google et al: Allow: /id So the question I have, which I can't find an answer to so far, is: if an allowed /id page 303-redirects to a /doc page, will it still be blocked by robots.txt? If yes, we're OK, but otherwise I'm going to disallow all /id resources in the robots file, as having the crawler hammer the db would be worse than losing search indexing for the /id pages.

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• Apt-get take long time to update\upgrade

  - by ShockwaveNN

  On my work network any apt-get (or aptitude) commands take a very long time, it's look's like admins blocked some port for it (for unknown reason). For example sudo apt-get update take like 2 days and all I get - a very long list of responses like Get: 36 http://security.ubuntu.com precise-security/universe amd64 Packages [11.6 kB] Get: 37 http://security.ubuntu.com precise-security/universe amd64 Packages [11.6 kB] Get: 38 http://security.ubuntu.com precise-security/universe amd64 Packages [11.6 kB] Get: 39 http://security.ubuntu.com precise-security/universe amd64 Packages [11.6 kB] Get: 40 http://security.ubuntu.com precise-security/universe amd64 Packages [11.6 kB] Same situation then I try to download software Get:1 http://archive.ubuntu.com/ubuntu/ precise/main dash i386 0.5.7-2ubuntu2 [85.8 kB] Get:2 http://archive.ubuntu.com/ubuntu/ precise/main dash i386 0.5.7-2ubuntu2 [85.8 kB] Get:3 http://archive.ubuntu.com/ubuntu/ precise/main dash i386 0.5.7-2ubuntu2 [85.8 kB] Get:4 http://archive.ubuntu.com/ubuntu/ precise/main dash i386 0.5.7-2ubuntu2 [85.8 kB] Get:5 http://archive.ubuntu.com/ubuntu/ precise/main dash i386 0.5.7-2ubuntu2 [85.8 kB] Is there something I can do to change port for apt-get or something else

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• My ubuntuone is broken, what is the problem?

  - by user6962

  I am on 10.10 and u1sdtool seems to be completely broken. I reinstalled it, no change. I can add my PC to the account, but it is added twice(!) every time I tried. So I have my netbook and two times my PC in the account. The netbook with 10.04 has no problems. Below is the error msg I get when attempting to startup Ubuntu One on the command line. desktop:~$ u1sdtool --status Oops, an error ocurred: Traceback (most recent call last): Failure: dbus.exceptions.DBusException: org.freedesktop.DBus.Error.NoReply: Did not receive a reply. Possible causes include: the remote application did not send a reply, the message bus security policy blocked the reply, the reply timeout expired, or the network connection was broken. desktop:~$ Starting it from the Me Menu has the same effect, the HDD will get really busy for a minute and then nothing happens, the client will not start. Nothing in the syslog or anywhere.

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• How do I allow all possible IPs for Gmail servers through my ufw firewall?

  - by nomadicME

  I am currently using the following rule: ufw allow out from my_local_ip to any port 587 This is a little too lax for my liking. I would like to tighten it up and restrict it to only gmail's smtp server ip addresses, but they are always changing. I used to just wait until an outgoing email didn't make it to its destination, then check syslog for the ip address that was blocked, then add that to the ufw configure script. However, now I have a need for much more reliability. Is there any way to use smtp.gmail.com in ufw? I don't think so, but thought I would ask. Any other ideas? Thanks.

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• Performance triage

  - by Dave

  Folks often ask me how to approach a suspected performance issue. My personal strategy is informed by the fact that I work on concurrency issues. (When you have a hammer everything looks like a nail, but I'll try to keep this general). A good starting point is to ask yourself if the observed performance matches your expectations. Expectations might be derived from known system performance limits, prototypes, and other software or environments that are comparable to your particular system-under-test. Some simple comparisons and microbenchmarks can be useful at this stage. It's also useful to write some very simple programs to validate some of the reported or expected system limits. Can that disk controller really tolerate and sustain 500 reads per second? To reduce the number of confounding factors it's better to try to answer that question with a very simple targeted program. And finally, nothing beats having familiarity with the technologies that underlying your particular layer. On the topic of confounding factors, as our technology stacks become deeper and less transparent, we often find our own technology working against us in some unexpected way to choke performance rather than simply running into some fundamental system limit. A good example is the warm-up time needed by just-in-time compilers in Java Virtual Machines. I won't delve too far into that particular hole except to say that it's rare to find good benchmarks and methodology for java code. Another example is power management on x86. Power management is great, but it can take a while for the CPUs to throttle up from low(er) frequencies to full throttle. And while I love "turbo" mode, it makes benchmarking applications with multiple threads a chore as you have to remember to turn it off and then back on otherwise short single-threaded runs may look abnormally fast compared to runs with higher thread counts. In general for performance characterization I disable turbo mode and fix the power governor at "performance" state. Another source of complexity is the scheduler, which I've discussed in prior blog entries. Lets say I have a running application and I want to better understand its behavior and performance. We'll presume it's warmed up, is under load, and is an execution mode representative of what we think the norm would be. It should be in steady-state, if a steady-state mode even exists. On Solaris the very first thing I'll do is take a set of "pstack" samples. Pstack briefly stops the process and walks each of the stacks, reporting symbolic information (if available) for each frame. For Java, pstack has been augmented to understand java frames, and even report inlining. A few pstack samples can provide powerful insight into what's actually going on inside the program. You'll be able to see calling patterns, which threads are blocked on what system calls or synchronization constructs, memory allocation, etc. If your code is CPU-bound then you'll get a good sense where the cycles are being spent. (I should caution that normal C/C++ inlining can diffuse an otherwise "hot" method into other methods. This is a rare instance where pstack sampling might not immediately point to the key problem). At this point you'll need to reconcile what you're seeing with pstack and your mental model of what you think the program should be doing. They're often rather different. And generally if there's a key performance issue, you'll spot it with a moderate number of samples. I'll also use OS-level observability tools to lock for the existence of bottlenecks where threads contend for locks; other situations where threads are blocked; and the distribution of threads over the system. On Solaris some good tools are mpstat and too a lesser degree, vmstat. Try running "mpstat -a 5" in one window while the application program runs concurrently. One key measure is the voluntary context switch rate "vctx" or "csw" which reflects threads descheduling themselves. It's also good to look at the user; system; and idle CPU percentages. This can give a broad but useful understanding if your threads are mostly parked or mostly running. For instance if your program makes heavy use of malloc/free, then it might be the case you're contending on the central malloc lock in the default allocator. In that case you'd see malloc calling lock in the stack traces, observe a high csw/vctx rate as threads block for the malloc lock, and your "usr" time would be less than expected. Solaris dtrace is a wonderful and invaluable performance tool as well, but in a sense you have to frame and articulate a meaningful and specific question to get a useful answer, so I tend not to use it for first-order screening of problems. It's also most effective for OS and software-level performance issues as opposed to HW-level issues. For that reason I recommend mpstat & pstack as my the 1st step in performance triage. If some other OS-level issue is evident then it's good to switch to dtrace to drill more deeply into the problem. Only after I've ruled out OS-level issues do I switch to using hardware performance counters to look for architectural impediments.

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• How do I update the IcedTea Plugin on 12.10?

  - by Brenton Horne

  Whenever I open up the page http://www.runescape.com/game.ws? in google chrome I get the notice, "IcedTea was blocked because it is out of date" and gives me the two options of updating it or running this time. I've gone to the link attached to the option of updating it and its a wikipedia page http://icedtea.classpath.org/wiki/Main_Page that wasn't helpful for me because I didn't know what to download and install. Whenever I click, 'Run this time' it works momentarily but it is prone to have the runescape interface in the browser disappear and be replaced with a black screen.

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• Google Search not displaying results from sub-pages

  - by nlovric

  I published a new site with some delicate content on September 26, 2012 UTC and no results from sub-pages - only from the main page - appear in Google Search. Entering "neven lovric" "cat out of the bag" into Google Search finds the main page. Is this type of behavior normal? I ask this because the first site was ceased - my account was locked - by the NameCheap, Inc. Risk Assessment Team, allegedly due to PayPal, Inc. reversing my payment for the extension of the registration of the domain before I was able to publish any content on it. In 2011 UTC, Google, Inc. blocked all results for certain keywords from being displayed to their users in the Arab Republic of Egypt during the demonstrations there. So, considering previous events, this is not an unlikely scenario in this case, also.

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• Best way to handle realtime melee AI in authoritative network environment

  - by PrimeDerektive

  So i've been working on a multiplayer game for a bit; it's a co-op action RPG with real-time combat. If you've seen or played TERA, I'd say it's comparable to that, but not an MMO, heh. I'm currently handling the AI units authoritatively, the server calculates their pathing, movement, and pursue/attack logic, and syncs the movement to the clients 15x per second, and the state changes when they happen. When I emulate 200ms ping, though, the client can perceive being out of range to an AI's attack, but still take the hit, because on the server he hadn't moved that far yet. This also plays hell with my real-time blocking. I don't really want to allow the clients to be allowed to say "that was out of range" or "I blocked that", but I'm not really sure how else to handle it.

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• How to use rel=canonical with Sitecore aliases?

  - by Mike G

  I have inherited a Sitecore architecture that is a mess from an SEO duplicate content POV. There are multiple aliases that have been created (and indexed by the search engines) for many of the 2nd tier pages of the site. Due to server issues, I am not able to 301 redirect these duped pages, so I would like to use the rel=canonical tag in an attempt to try and get Google/Bing to recognize the correct pages I would like to appear in the index. I have blocked the most extraneous duped pages with a robots.txt file, however, since Google/Bing have already spidered many of the duped pages, I need to keep them accessible to the spiders, BUT removed from the index. The catch is, since the duped pages are aliases (and don't really physically exist in Sitecore that I can find), I am not sure how to go about using rel=canonical - or if I even can in this situation..?

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• Thread problem with XNA C#

  - by Luis

  I'm development a network card game, and for now i've two players connected but there is a problem with one of them, this one can't do anything on the game. Looks that screen was blocked. I'm think that is because a code i used before. That code is: if (InvokeRequired) { this.Invoke(new MethodInvoker(delegate { ... })); return; } The code above is surrounding code to changing Button values, make connection with server and create game window. Without this code a warning is shown. InvalidOperationException was unhandled Cross-thread operation not valid: Control 'startGameButton' accessed from a thread other than the thread it was created on.

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• DesktopCouch does not sync

  - by burli

  I have here two computers, both installed with Ubuntu 10.10. The Laptop uses the Netbook Edition. Both are connected, file sync and Tomboy Notes are working. My Desktop syncs databases with Ubuntu One, my Laptop does not. If I delete for example the contacts Database on my Desktop, the database is back a view seconds later. If I delete the same database on my laptop, nothing happens. (I'm using Futon) If I kill beam, delete the config and try to restart with the dbus-send I got an error Error org.freedesktop.DBus.Error.NoReply: Did not receive a reply. Possible causes include: the remote application did not send a reply, the message bus security policy blocked the reply, the reply timeout expired, or the network connection was broken. How can I fix that?

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• Some applications (Anki, Okular, Calibre) start very slowly

  - by k1U

  When I start one of the applications mentioned in the title from the terminal, I get this: Registered DEC: true Error in contacting registry "org.freedesktop.DBus.Error.NoReply" "Did not receive a reply. Possible causes include: the remote application did not send a reply, the message bus security policy blocked the reply, the reply timeout expired, or the network connection was broken." Could not query active accessibility event listeners. Registered event listener change listener: true Currently I am running 12.04 This problem started a couple of days ago, shortly after I've installed okular from within the software center. by "slow" I mean it takes about 30 seconds. Other applications like chromium start instantly.

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• C++ AMP recording and slides

  - by Daniel Moth

  Yesterday we announced C++ Accelerated Massive Parallelism. Many of you want to know more about the API instead of just meta information. I will trickle more code over the coming months leading up to the date when we will share actual bits. Until you have bits in your hand, it is only your curiosity that is blocked, so I ask you to be patient with that and allow me to release this on our own schedule ;-) You can now watch my 45-minute session introducing C++ AMP on channel9. You will also want to download the slides (pdf), because they are not readable in the recording. Comments about this post welcome at the original blog.

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• Error : Could not display "obex://" when paired with a Nokia 3110c

  - by MobileDev123

  Hi, I have paired my nokia 3110c via bt on my pc, I can receive a file from my pc to the phone, but I can not browse the contents of phone from my computer. Here is the error message Error: Did not receive a reply. Possible causes include: the remote application did not send a reply, the message bus security policy blocked the reply, the reply timeout expired, or the network connection was broken. Please select another viewer and try again. How can I transfer contents from my phone to my computer?

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• Redirect public traffic to a different subfolder, while local traffic remains unchanged

  - by ecnepsnai

  I would like to have local (intranet) HTTP traffic go to the /var/www/html folder while any public traffic goes to the subfolder, /var/www/html/public I've tried this configuration, with some variation, in httpd.conf <VirtualHost PRIVATE-IP> DocumentRoot /var/www/html ServerName ecn ErrorLog /var/www/logs/error/private CustomLog /var/www/logs/access/private common </VirtualHost> <VirtualHost PUBLIC-IP> DocumentRoot /var/www/html/public ServerName PUBLIC-DOMAIN-NAME ErrorLog /var/www/logs/error/public CustomLog /var/www/logs/access/public common </VirtualHost> PUBLIC-IP, PRIVATE-IP, and PUBLIC-DOMAIN name are all replaced with the correct values in the actual document. The problem is, local traffic can browse fine but remote traffic is directed to the root folder and getting 403d (because I have that folder blocked off through my .htaccess file). If I append /public to the URL it works fine.

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• What are some potential issues in blocking all incoming requests from the Amazon cloud?

  - by ElHaix

  Recently I, along with the rest of the world, have seen a significant increase in what appears to be scraping from Amazon AWS-related sources. So simply put, I blocked all incoming requests from the Amazon cloud for our hosted application. I know that some good services/bots are now hosted on the cloud, and I'm wondering if certain IP addresses should be allowed, as they may gather data that would in the end benefit our site's SEO rankings? -- UPDATE -- I added a feature to block requests from the following hosts: Amazon Softlayer ServerDeals GigAvenue Since then, I have seen my network traffic decrease (monitored by network out bytes). Average operation is around 10,000,000 bytes. You can see where last week I was not blocking, then started blocking. I've since removed the blocks and will see what the outcome is.

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• Start & Stop internet connexion without broking Network Manager

  - by user3634569

  I am on Precise. I used this command (with an alias), to close the network, dbus-send --system --print-reply --reply-timeout=120000 --type=method_call --dest=org.freedesktop.NetworkManager /org/freedesktop/NetworkManager org.freedesktop.NetworkManager stop it worked, now I have to use dbus-send --system --print-reply --reply-timeout=120000 --type=method_call --dest=org.freedesktop.NetworkManager /org/freedesktop/NetworkManager org.freedesktop.NetworkManager.Sleep boolean:true it work but not so well, sometimes I can't restart the network and NetworkManager is blocked too and strange errors even GUI freeze . What I need is a command line which close the network and don't mess with Network Manager, maybe with the routing table or what else.

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• What happened to my files?

  - by Ivan Broes

  After a successful upgrade from 11.04 to 11.10 a gradual deterioration occurred -- my laptop became unstable with updates -- I corrected the Aspell file, only to have another appear, I sought but I was blocked out. Had an idea, but resolved one that another problem appeared -- going from bad to worse -- I re-installed windows Vista and Ubuntu 11.10 in the original partitions. Window called it Windows Old and I had no problems recovering my files there - Ubuntu decided it is going to make a new Home directory -- . the questions is where did these files go to after re-installation -- are they deleted? If so That's fine duplicates are in Ubuntu 1 by synchronization - I can only download one file at a time!

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