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  • Is it better to use a crowded 2.4GHz Wi-Fi channel 1, 6, 11 or "unused" 3, 4, 8, or 9?

    - by Luke
    I understand that 2.4GHz Wi-Fi channels overlap, and that the only non-overlapping channels in the US are 1, 6, and 11. Generally, my signal strength on channels 1, 6, and 11 are much stronger than my neighbors' on the same channel. However, several of the channels may have 4 or 5 others on that same channel. In this scenario, is it better to use 3, 4, 8, or 9? Or is it better to use the crowded channels 1, 6, and 11? As a secondary question, does it even matter that my signal strength is much higher than theirs? Related: Why use wifi channels other than 1, 6 or 11?

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  • how to restore windows 7 to a know working state every time it boots

    - by Artanis
    A couple of days ago my mother asked me to set up a computer at his house, she wants to use it to basic web browsing, video chat and nothing more. The problem is, neither my mother nor my sister know anything about using or maintaining a computer. What I want is to have a working base install of windows 7 and just discard everything installed, downloaded, ... when it reboots. That way I can set up a partition just for saving files and whatever they do the computer will always return to a working state at start up. can that be done? PS: Sadly linux is not an option since my sister wants to be able to play some games with my steam account and not all of them run with wine.

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  • MS 2008 R2 Drops Remote Desktop Sessions in 10 seconds or less every time

    - by mike42
    I'm adding a new 64-bit server to our domain. Everything seems fine except when accessing the machine using remote desktop, after a few seconds the connection is lost. The error message is "This computer can't connect to the remote computer." "Try connecting again. If the problem continues, contact the owner of the remote computer or your network administrator." A similar result with Telnet on port 3389. I am able to connect but if I hit a key the connection to host lost. The event log shows the successful login. No errors. Any ideas?

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  • Computer wakes up from hibernation at exctly 3:40am every day

    - by vascoFG
    I'm getting tired of waking up to my computer being turned on, and event log shows that it's waking up everyday at 3:40am and most times won't go back to sleep after the determined 30 minutes (maybe from being in the lock screen?). There are no devices armed for wake, activation timers are disabled and all wake options disabled in the BIOS and energy star 4.0c is enabled (was disabled before but no difference).

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  • Apache restart on every request

    - by Michael Gummelt
    In development, I'd like to have changes to my application propagate immediately. "MaxRequestsPerChild 1" restarts each process after a request, but if there are multiple server processes, changes still don't propagate until each process restarts. I've tried several different directives to limit the number of server processes to 1: StartServers 1 MinSpareThreads 1 MaxSpareThreads 1 ThreadLimit 1 ThreadsPerChild 1 MaxClients 1 MaxRequestsPerChild 1 Apache still starts with multiple (3) apache2 processes. I'm using the mpm_worker module

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  • Is it possible to restrict the connection duration per client on the router (say with OpenWRT)?

    - by static
    How to limit the connection duration per client per period (say, one MAC-address can connect only for 3 hours per week to the network). Where could be defined such a rule? In the firewall? So the rule should define not statically times (this is simple), when the client is allowed to access the network, but the duration of the connection per day/week/month, etc. How/where to implement such rules? Is it possible to do so with OpenWRT/DD-WRT?

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  • Server down at 23:26 every night

    - by miccet
    We are having a big problem with our sites stability the last couple of weeks and after endless hours of troubleshooting I don't get anywhere. So I turn to you dear community. Setup: 2 x VPS servers - Front end, 8 core, 8G RAM. - Database, 5 core, 3G RAM. Both running Ubuntu. Ruby on Rails EE with Passenger 3 and Rails 2.3.11. MySQL 5.1.67. The problem is that each night, at the exact same time (23:26) the SQL server suddenly shows a processlist full of COMMIT with an increasing Time. After 30-40 seconds (can go longer) a wave seems processed and the site responds for a few seconds before it repeats. During this hick up the database server load spikes while the front end is relaxing. I have looked at slow queries, but is not finding any locks or other unusual queries ran at this time. I have looked at iotop at the time of the halt and there is no activity from mysql. I also tried turning off query_cache and messed around with the mysql configuration file without much change. Any ideas?

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  • Applications on my laptop crashees every 10-20 minutes [closed]

    - by user1731110
    In my windows 7 home premium, several of my application crashes after some minutes even wehn I am not touching system. For example I have outlook 2007, that works fine, but suddenly crashes. The same about visual studio 2012. It is also crashes after some minute no matter if I am working on a project or I am not touching it. the same behaviour is there, for other applications (skype, oovoo and ...). I use Microsoft security essential and there is no virus on my system. I also checked my system with Sophos anti root kit and there is no root kit there. What would be the problem?

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  • point subdomain to (sub-) directory on IIS 7

    - by Max
    I have quite a newbie question, but here it is anyway: one of our customers has a domain, e. g. examplecustomer.com which points to the customers website. This server is a apache webserver. Now we have another server using IIS 7, where some .NET web app will be running. This .NET app is in a subdirectory of the windows webserver, e. g. C:\inetpub\wwwroot\my_app\ What I would like to have: a subdomain like app.examplecustomer.com points to C:\inetpub\wwwroot\my_app\ (no redirect or so, app.examplecustomer.com is the domain that the web app is using). How can I setup the windows webserver to work that way? It should still be possible to host other apps on that server, too. Like: anotherapp.examplecustomer.com goes to C:\inetpub\wwwroot\my_anotherapp\ etc.

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  • Cause of laptop only booting once every 3-10 times

    - by user16441
    My 3-year old Asus EEE laptop has been working flawlessly in the past, but in the last week it has started behaving oddly. When I boot, one of the following happens: Screen remains totally black. Absolutely nothing comes up. I need to retry booting. (Happens 70% of the time). Laptop starts regular boot. However, somewhere during the boot process it goes black and I need to retry (20% of the time). Screen turning black is more likely when I move the laptop around during boot. Laptop boots properly. Once booted, all is fine. But I'm afraid to turn it off and have been keeping the laptop running till the night. Additional details: All normal lights light up when I boot; whichever of the scenarios goes down. There are no odd sounds or beeps, whichever of the scenarios goes down. I thought it might be the SSD drive that is dying, but it does not use SMART and it appears difficult to troubleshoot. I tried booting with and without the battery, but the scenarios are identical. Before completely investigating the hard drive, I'd like to hear opinions regarding the cause of this problem. Is this most likely the hard drive, or could there be another cause for these symptoms? Using Arch Linux.

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  • What is the point of connecting two routers directly together

    - by rubixibuc
    The way subnets work, wouldn't connecting two router interfaces together require their own subnet between them. Unless that subnet mask has 31 bits, wouldn't that was adress space. I'm asking because I often seen that done in networking books. How can this be done without wasting IP Addresses? They usually draw this when explaining subnetting. They have a central router connected to several other each one supposed to be creating their own subnet. Is this really how subnettimg is done? Example <-------[Router 1]-----Wasteful Subnet-------[Router 2]------> | | | \/

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  • Should I give the answer to a failed interview coding exercise?

    - by GlenH7
    We had a senior level interview candidate fail a nuance of the FizzBuzz question*. I mean, really, utterly, completely, failed the question - not even close. I even coached him through to thinking about using a loop and that 3 and 5 were really worth considering as special cases. He blew it. Just for QA purposes, I gave the same exact question to three teammates; gave them 5 minutes; and then came back to collect their pseudo-code. All of them nailed it and hadn't seen the question before. Two asked what the trick was... On a different logic exercise, the candidate showed some understanding of some of the features available within the language he chose to use (C#). So it's not as if he had never written a line of code. But his logic still stunk. My question is whether or not I should have given him the answer to the logic questions. He knew he blew them, and acknowledged it later in the interview. On the other hand, he never asked for the answer or what I was expecting to see. I know coding exercises can be used to set candidates up for failure (again, see second link from above). And I really tried to help him home in on answering the core of the question. But this was a senior level candidate and Fizz-Buzz is, frankly, ridiculously easy even with accounting for interview jitters. I felt like I should have shown him a way of solving the problem so that he could at least learn from the experience. But again, he didn't ask. What's the right way to handle that situation? *Okay, that's not the link to the actual FizzBuzz question, but it is a good P.SE discussion around FizzBuzz and links to the various aspects of it.

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  • new[n] and delete every location with delete instead the whole chunk with delete[]

    - by pmr
    Is this valid C++ (e.g. not invoking UB) and does it achieve what I want without leaking memory? valgrinds complains about mismatching free and delete but says "no leaks are possible" in the end. int main() { int* a = new int[5]; for(int i = 0; i < 5; ++i) a[i] = i; for(int i = 0; i < 5; ++i) delete &a[i]; } The reason I'm asking: I have a class that uses boost::intrusive::list and I new every object that is added to that list. Sometimes I know how many objects I want to add to the list and was thinking about using new[] to allocate a chunk and still be able to delete every object on its own with the Disposer-style of boost::intrusive.

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  • Moving a point along a vector

    - by Chris
    Hello- I have a point defined by x,y and a vector defined by heading, speed. I am attempting to move the point x,y along this vector, at a distance of 'speed'. Below is the code I am currently using: self.x += self.speed * cos(self.heading); self.y += self.speed * sin(self.heading); Heading can be any angle in a full circle - 0 to 2p (0-360 degrees). The problem is the above code: Only moves along the x or y axis when angle is 0-270 for example, when the avatar is facing the top-right corner (45 degrees relative), it moves straight up. Does not move at all when angle is 270-360 heading, speed, X and Y are all doubles, and heading is reported by the user touching a direction-pad in the lower corner. I know the heading is correct because the avatar rotates to the correct direction, it is just the actual movement I am having problems with. Thanks for any help - Chris

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  • Silverlight 4 crashing every browser (SL3 doesn't)

    - by Simon_Weaver
    I am testing my application on a number of machines. It is fine on every machine except 1. I'm having problems with one XP machine where in internet explorer, chrome and firefox the Silverlight plugin crashes on EVERY page with Silverlight. Pages that used to work fine with silverlight 3 crash instantly - including my app and the Silverlight Beta 4 demo page!!! The browser crashes instantly and doesn't even attempt to load the page. I don't know how to debug this because there's no error. It just crashes instantly in all these browsers. Reinistalling, rebooting didn't fix the problem.

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  • How to make every word in the text clickable and send it to the script

    - by fakson
    I have a text for example "The quick brown fox jumps over the lazy dog. The quick brown fox jumps over the lazy dog. The quick brown fox jumps over the lazy dog. The quick brown fox jumps over the lazy dog." When i click on word i must get data from XML or from mysql about this word. How i can make every word active for click and send it to another script for example: I click on dog, and in new window i get information about dog? on fox about fox? every word must be clickable Any ideas, links or examples? Using php, mysql, jquery, ajax

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  • Intersection point in silverlight/wpf

    - by Andrei Neagu
    Hello, Given a path like this one : <Path Stretch="Fill" Stroke="#FFD69436" Data="M 0,20 L 22.3,20 L 34,0 L 44.7,20 L 68,20 L 55.8,40 L 68,60 L 44.7,60 L 34,80 L 22.3,60 L 0,60 L 11.16,40 L 0,20 Z"> <Path.Fill> <LinearGradientBrush StartPoint="0,0" EndPoint="0,1"> <LinearGradientBrush.GradientStops> <GradientStop Color="#FFFFFF" Offset="0" /> <GradientStop Color="Orange" Offset="1" /> </LinearGradientBrush.GradientStops> </LinearGradientBrush> </Path.Fill> </Path> How can I get the point that is at the edge of this figure at any angle? Lets say that I want the intersection point between the edge of this figure and a line passing through the center of this figure, at the 30 degrees angle with the OX axe? thanks.

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  • Projecting a 3D point to 2D screen coordinate OpenTK

    - by sinsro
    Using Monotouch and OpenTK I am trying to get the screen coordinate of one 3D point. I have my world view projection matrix set up, and OpenGL makes sense of it and projects my 3D model perfectly, but how to use the same matrix to project just one point from 2D to 3D? I thought I could simply use: Vector3.Transform(ref input3Dpos, ref matWorldViewProjection, out projected2Dpos); Then have the projected screen coordinate in projected2DPos. But the resulting Vector4 does not seem to represent the proper projected screen coordinate. And I do not know how to calculate it from there on.

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  • Huge dataset point in polygon in .net (collision detection)

    - by Rickard Liljeberg
    I have a pretty big mesh with polygons, usually triangles but sometimes rectangles. Each point in my mesh has a value (value has nothing to do with coordinates). Now I am creating a second mesh in the same coordinate-space as the old mesh. I now want to interpolate out values for all points (vertices) in the new mesh using the values from the old mesh. Now I could loop each polygon in the new mesh and detect which old vertices are in each polygon by making 2d collision detection (altho even this I don't get to function properly so if anyone has simple and fast code for 2d collision detection (triangle is enough) I would gladly see it). However to my main point again. looping each old vertice for each new polygon seems less than efficient. is there a better way?

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  • What should every programmer know about security ?

    - by M.H
    I am an IT student and I am now in the 3rd year in university,until now we are studing a lot of subjects related to computer in general (Programming,Algorithms,Computer architecture,maths....etc). But there is a whole world called security we are very far from it ,I mean here security in general(Computers Security,Interner Security,Networks Security,hacking,cracking...etc). I am very sure that nobody can learn every thing about security but sure there is a "minimum" knowledge every programmer or IT student should know about it and my question is what is this minimum knowledge ? can you suggest some E-books or courses or any thing can help to start with this road ?

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  • How to center text around point using xaml

    - by Pete d'Oronzio
    I would like to be able to place the word "hello" centered on a specific point. I need to do this completely in XAML without extra code. Best I can tell, all the text alignment properties/styles in XAML act on text within some bouding canvas or other element. Since I don't know the length of the text I want to center, I can't center it using my own code. The reason I need to solve the problem entirely in XAML is that I'm not using WPF to create the XAML, I'm writing it directly to an XML DOM. It will then be loaded into a Silverlight or WPF control for display. In most graphic languages, including SVG, which is where my code originated, text can be aligned against a "stationary point" without a bounding box. Any suggestions appreciated

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  • Finding coordinates of a point between two points?

    - by Nicros
    Doing some 3D stuff in wpf- want to use a simpler test to see if everything is working (before moving to curves). The basic question is given two points x1,y1,z1 and x2,y2,z2 I have calculated the distance between the points. But how to find the coordinates of another point (x3,y3,z3) that lies on that line at some distance? I.e. if my line is 100 long between -50,0,0 and 50,0,0 what are the coordinates of the point at 100 * 0.1 along the line? I think this is a simple formula but I haven't found it yet....

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  • What should every programmer know?

    - by Matt Lacey
    Regardless of programming language(s) or operating system(s) used or the environment they develop for, what should every programmer know? Some background: I'm interested in becoming the best programmer I can. As part of this process I'm trying to understand what I don't know and would benefit me a lot if I did. While there are loads of lists around along the lines of "n things every [insert programming language] developer should know", I have yet to find anything similar which isn't limited to a specific language. I also expect this information to be of interest and benefit to others.

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