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• How to find out the dependency paths?

  - by ???

  For example, there are packages and their dependencies: a -> b (a require b) b -> c & d x -> a y -> x z -> x z -> x & y Now, give c and z, there are two dependency paths: z -> x -> a -> b -> c z -> y -> x -> a -> b -> c The question is how to find out the dependency paths between two specific Debian packages? P.S. The idea behind is to draw the dependency graph for a given set of packages, include the intermediate ones missing in the chain.

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• CSF Unresolved issue

  - by josephmarhee

  I began receiving service failures for CSF/LFD once the limit was reached in iptables preventing the service from working properly. I flushed all iptables rules, and redid by rules using CIDR rather than the individual IPs that were listed and the issue persists. Error: The VPS iptables rule limit (numiptent) is too low (1527/1536) - stopping firewall to prevent iptables blocking all connections, at line 1459 This is after restarting CSF, which gave me: You have an unresolved error when starting csf. You need to restart csf successfully to remove this warning CSF still seems to be trying to enforce rules that no longer exists (lists entire chains upon trying to be restarted,only to fail with that error). Any idea of what's going on?

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• have 2 exchange servers to communicate together!

  - by Data-Base

  we have our exchange server 2007 (10.10.2.11) at work with domain "dddddd.com" and ironport and it work just fine! we need to test some thing at work with Exchange 2010 !! so we came up with this idea: we created a locked network and install firewall (10.10.2.88) the locked network has it's own DC and Exchange servers! we used the domain "dddddd.loc" any way it will be deleted! IPs DC 10.0.0.1 EX 10.0.0.11 now the Exchange server up and running in the firewall (10.10.2.88) we opened the ports and forwarded it to the Exchange2010 (10.0.0.11) in our main DC we defined the zone dddddd.loc to the firewall and the MX records as well but when we test we get error now how to make it so that the 2010 will send email directly to the 2007 (we will not use it to more that that)? and the 2007 will send the email to 2010 if the email has the domain dddddd.loc ?

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• How to go about designing an intermediate routing filter program to accept input and forward accordingly?

  - by phileaton

  My predicament: I designed an app, written in Python, to read my mail and check for messages that contain a certain digital signature. It opens these and looks for keywords. If the message contains these keywords, certain related functions area executed on the computer. It is a way I can control my computer from my cell phone without being there. I am still in the beginning stages and it can only currently remotely open and close applications/processes. The obvious issue is security risks. I hoped to spearhead that by requiring and checking for that digital signature. However, my issue comes when I'd like to make this program usable by multiple users. The idea is that the user will send keywords: username and password, for instance, to log into their personal email account and send messages to it to be parsed. Please ignore the security implications of sending non-encoded passwords through email. (Though if you could help me on that part I'd much appreciate it as well, but currently, that is not the scope of my question.) My issue is designing an intermediary process that will take an email/password to read an email and scan for those keywords. The issue is, that the program has to be accessing an email to read the email for the username/password! I have got myself into a loop and cannot figure out how to have this required intermediary program. I could just create an arbitrary email account and have that check for login-creds, but is there a better way of doing this than that? Also, is there a better way of communicating with a computer remotely than this? Especially if the computer is not a server and is behind a router with only a subnet ip? If I am asking this question in the wrong place, I deeply apologize. Any help would be much appreciated!

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• Create Math Game with PHP, Ajax, Jquery

  - by Sambucasun

  I am developing a website where user can create their own game which can be joined by other users as well. It's a simple maths game which will shoot equations based on time or count specified. I want that moment user create a game, it will be listed in "current Games" section. Other users can check out the list and select the game to join. After game is created, creater should have a screen which should be having his name with display pic. Now gradually as others start joining the game, list should updated automatically. Once enough users are there i will start the game. The same list should be displayed to other users who join the game. Once game is over all will be displayed a summary list. I have gone through couple of threads but could not get clear idea. Do I need to use comet or other technology to create such game or simple PHP, Ajax or Jquery will suffice ? Also I want my website should be mobile compatible so i am designing it in html5. If i create this game using just Ajax then will there be any performance issue while playing through mobile. I am not much experienced so just need guidance for what should be appropriate or use for my requirement.

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• Install Composer on Ubuntu

  - by Milos

  I am trying to install composer with the command: sudo curl -s https://getcomposer.org/installer | php And I am getting this error: All settings correct for using Composer Downloading... Download failed: failed to open stream: Permission denied Downloading... Download failed: failed to open stream: Permission denied Downloading... Download failed: failed to open stream: Permission denied The download failed repeatedly, aborting. I don't know why? Do you have an idea? I tryed to google it but nothing.

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• Bringing my Dell XPS 13 ultrabook back to factory state

  - by TysHTTP

  I have a brand new Dell XPS 13 ultra book. After i picked it up at the store, i wiped the exising partitions which also contained the restore/rescue data, which you need to reinstall the factory version of Windows 8 that comes with this machine. I did this because we have a different MS partner edition of Windows which i prefer to run. After doing all this, i noticed that there was something wrong with machine. No real damage, but the specs are not completely as they should be. Turned out that a simple mistake while ordering. Now, long story short, the shop says that it has no problem with taking the product back, as long as it is in it's original state. And this is the problem i'm having, because i formatted the original partitions that contain that rescue option / windows 8 setup, i don't have a clue whether it's possible to get back to that original. Does anyone have an idea on how to get this fixed?

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• Reverse Proxy (mod_rewrite) and Rails (absolute paths)

  - by SooDesuNe

  I have front end rails app, that reverse proxies to any of a number of backend rails apps depending on URL, for example http://www.my_host.com/app_one reverse proxies to http://www.remote_host_running_app_one.com such that a URL like http://www.my_host.com/app_one/users will display the contents of http://www.remote_host_running_app_one.com/users I have a large, and ever expanding number of backends, so they can not be explicitly listed anywhere other than a database. This is no problem for mod_rewrite using a prg:/ rewrite map reverse proxy. The question is, the urls returned by rails helpers have the form /controller/action making them absolute to the root. This is a problem for the page served by mod_rewrite because links on the proxied page appear as absolute to the domain. i.e.: http://www.my_host.com/app_one/controller/action has links that end up looking like /controller/action/ when they need to look like /app_one/controller/action mod_proxy_html seems like the right idea, but it doesn't seem to be as dynamic as I would need, since the rules need to be hard coded into the config files. Is there a way to fix this server-side, so that the links will be routed correctly?

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• Distribution upgrade freezes

  - by lugte098

  When upgrading from Ubuntu 10.04 to 10.10 the distribution upgrade program freezes after it notifies me of a change in /etc/apparmor.d/usr.bin.mysqld and asks me to keep the old file or accept the new changes (I accepted them). The terminal says: Configuration file `/etc/apparmor.d/usr.sbin.mysqld' ==> Modified (by you or by a script) since installation. ==> Package distributor has shipped an updated version. What would you like to do about it ? Your options are: Y or I : install the package maintainer's version N or O : keep your currently-installed version D : show the differences between the versions Z : start a shell to examine the situation The default action is to keep your current version. *** usr.sbin.mysqld (Y/I/N/O/D/Z) [default=N] ? y Installing new version of config file /etc/apparmor.d/usr.sbin.mysqld ... The program hasn't done anything after this for about 2 hours now and I have no idea what I should do at this point. Can I quit the program and restart it? Or is there another action I should take? It did however change the '/etc/apparmor.d/usr.sbin.mysqld' to the new version, but is still frozen...

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• ssh can't connect after server ip changed

  - by Kery

  I have a server with ubuntu installed. After I change the network configuration and restart server, ssh client can't connect server any more. But in the server I can use ssh client to connect itself and the netstat command shows that sshd is listening port 22. And in my computer (win7) ping command is OK to server's new IP. The configuration in /etc/network/interfaces is: auto eth0 iface eth0 inet static address 10.80.x.x netmask 255.255.255.0 gateway 10.80.x.1 I'm very confused about this. Hope somebody can give me some idea. Thank you in advance!!!

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• opengl memory issue - quite strange.

  - by user4707

  Hello, I have heard that textures consumes lot of memory but I am surprised how much.... I have 7 textures 1024 16 bit each. And while I will run my app it consumes 57MB of memory. I think that this is "a bit" too much. I am writing 2D application (no cocos or other framework) Strange is that while I will compile my app with disabled rendering methods: glDrawArrays than It uses only 27MB.... which is about 30MB less... Do you have any Idea why? I am creating textures before rendering of course: rendering looks like this: [EAGLContext setCurrentContext:context]; glBindFramebufferOES(GL_FRAMEBUFFER_OES, defaultFramebuffer); glClearColor(0.0f, 0.0f, 0.0f, 1.0f); glClear(GL_COLOR_BUFFER_BIT); glPushMatrix(); glEnableClientState(GL_VERTEX_ARRAY); glEnableClientState(GL_TEXTURE_COORD_ARRAY); glEnable(GL_TEXTURE_2D); glEnable(GL_BLEND); glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA); TeksturaObrazek *obrazek_klaw =[[AppDirector sharedAppDirector] obrazek_klaw]; glBindTexture(GL_TEXTURE_2D, [[obrazek_klaw image_texture] name] ); glVertexPointer(2, GL_FLOAT, 0,vertex1); glTexCoordPointer(2, GL_FLOAT, 0, vertex2); glColor4f(1,1,1,alpha); glDrawArrays(GL_TRIANGLE_STRIP, 0, 4); glDisable(GL_BLEND); glDisable(GL_TEXTURE_2D); glDisableClientState(GL_TEXTURE_COORD_ARRAY); glPopMatrix(); [context presentRenderbuffer:GL_RENDERBUFFER_OES]; It looks like standard routine... I have spent about 2 days looking for for answer and I still have no clue.

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• who delete my files?

  - by akalter

  I have some linux server. on two of our server we have mysql. we have daily backup on both machine. but the script different. i saw both scripts. on one of them i saw the "delete older files" algorithm, but in the other this is happening but not from the script. i trying to know who dletes my files, because of that i want to use same script on both machine because of that in the script with the deletion i also copy the files to the another server, and i want to do that in both servers. Who have an idea who delete my older backups? Thank you!

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• TOP CPU usage for whole system

  - by heike

  I am using a machine that has using cat /proc/cpuinfo | grep processor | wc -l returning 8 I am trying to load the server using a load generator that I wrote, and capture the behaviour of TOP command for idle (as the software that is tested on server runs on ROOT). Doing the load as an increasing step function, I capture the idle state every second, and see the result. Strange thing is that when I increase the load every 1 minute, the idle state is infact increasing (??). This honestly does not make sense .. I thought with more load, the idle state will decrease, and the cpu usage will increase. Is there any reasonable explanation for this behaviour, maybe for the server utilization itself? Thanks for any feedback -- ok, no idea for the down vote. but I try to find this behaviour a lot, can not find any reasonable things to explain this ..

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• Mirror network packets from WiFi to Ethernet in an ASUS Router RT N53

  - by fazineroso

  I have an ASUS RT N53 router, running the default firmware (Linux 2.6.22 with busybox and uclibc). I need to capture data packets from some Wi-Fi devices I have connected to that router (iPad and some smartphones), but the router is not forwarding any package coming from Wi-Fi devices to the Ethernet Ports. Any idea how can I proceed? Available tools in the router are iptables (no tee option, though), ebtables, brctl... Currently the ethernet and Wifi devices are forming a bridge: # brctl show bridge name bridge id STP enabled interfaces br0 8000.50465dc06be2 no vlan0 eth1 No ebtables rules: # ebtables -L Bridge table: filter Bridge chain: INPUT, entries: 0, policy: ACCEPT Bridge chain: FORWARD, entries: 0, policy: ACCEPT Bridge chain: OUTPUT, entries: 0, policy: ACCEPT

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• MVC and delegation

  - by timjver

  I am a beginning iOS programmer and use the Model-View-Controller model as a design pattern: my model doesn't know anything about my view (in order to make it compatible with any view), my view doesn't know anything about my model so they interact via my controller. A very usual way for a view to interact with the controller is through delegation: when the user interacts with the app, my view will notify my controller, which can call some methods of my model and update my view, if necessary. However, would it make sense to also make my controller the delegate of my model? I'm not convinced this is the way to go. It could be handy for my model to notify my controller of some process being finished, for example, or to ask for extra input of the user if it doesn't have enough information to complete the task. The downside of this, though, is that my controller would be the delegate for both my controller and my model, so there wouldn't be really a proper way to notify my model of changes in my view, and vice versa. (correct me if I'm wrong.) Conclusion: I don't really think it's a good idea to to have my controller to be the delegate of my model, but just being the delegate of my view would be fine. Is this the way most MVC models handle? Or is there a way to have the controller be the delegate of both the controller and the model, with proper communication between them? Like I said, I'm a beginner, so I want to do such stuff the right way immediately, rather than spending loads of hours on models that won't work anyway. :)

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• Could a singleton type replace static methods and classes?

  - by MKO

  In C# Static methods has long served a purpose allowing us to call them without instantiating classes. Only in later year have we became more aware of the problems of using static methods and classes. They can’t use interfaces They can’t use inheritance They are hard to test because you can’t make mocks and stubs Is there a better way ? Obviously we need to be able to access library methods without instantiated classes all the time otherwise our code would become pretty cluttered One possibly solution is to use a new keyword for an old concept: the singleton. Singleton’s are global instances of a class, since they are instances we can use them as we would normal classes. In order to make their use nice and practical we'd need some syntactic sugar however Say that the Math class would be of type singleton instead of an actual class. The actual class containing all the default methods for the Math singleton is DefaultMath, which implements the interface IMath. The singleton would be declared as singleton Math : IMath { public Math { this = new DefaultMath(); } } If we wanted to substitute our own class for all math operations we could make a new class MyMath that inherits DefaultMath, or we could just inherit from the interface IMath and create a whole new Class. To make our class the active Math class, you'd do a simple assignment Math = new MyMath(); and voilá! the next time we call Math.Floor it will call your method. Note that for a normal singleton we'd have to write something like Math.Instance.Floor but the compiler eliminates the need for the Instance property Another idea would be to be able to define a singletons as Lazy so they get instantiated only when they're first called, like lazy singleton Math : IMath What do you think, would it have been a better solution that static methods and classes? Is there any problems with this approach?

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• Which is the cheapest machine where I can run linux and plug in some webcams? (and with network inte

  - by marc.riera

  I'm looking for a very cheap machine to run a linux distro for security(anti-thief) software. I would like to be able to connect to the network and a couple of webcams. May be ip-webcams or usb-webcams. The idea is having a machine with batteryes, laptop style, but there is no need to have a display/monitor attatched all the time. I'm planning to spend no more than 200$, in case it also gets stolen. Any advice on what to buy? (all modifications to this security plan are welcome) Thanks.

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• Can't rename folders in Window 7/32bit after anti-virus change

  - by Tasos

  I recently started having the common, as I realized, problem of not being able to rename folders in Windows 7 (32 bit). I don't understand why it happened after almost a year of ideal use of Windows 7. I haven't removed the libraries nor can I think of anything else that could potentially cause this, at least as far as I know. The only thing I did recently was to change my anti-virus program from the freeware version of Avira to the freeware anti-virus Microsoft Security Essentials. Any idea on what the problem is and how to fix this?

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• dhcp client service won't start

  - by xyious

  I have a Laptop with 2 network interfaces and neither will get an IP address through dhcp. I found out that the dhcp client service didn't start. Upon manually starting it gives the error 2: File not found. I have checked that the files were there (both svchost and dhcpcore .dll), the local service account has read access to the system32 folder, the path in the registry is also correct and I can access the file. I have tried to netsh winsock reset and ip reset all. I have even added the local service account to the administrators group. sfc /scannow also came up clean. I have no idea what else I can try. Any suggestions are welcome. (side note it's a windows 7 32 bit, atheros wlan, deinstalled avira before any of the other troubleshooting)

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• how does HDR work?

  - by dotminic

  I'm trying to understand what HDR is and how it works. I understand the basic concepts and have an slight idea of how it is implemented with D3D/hlsl. However it's still pretty foggy. Say I'm rendering a sphere with a texture of the earth and a small point list of vertices to act as stars, how would I render this in HDR ? Here are a few things I'm confused about: I'm guessing, I can't use just any basic image format for the texture as the values would be limited to [0, 255] and clamped to [0, 1] in a shader. Same goes for the back buffer, I take it the format needs to be a float point format ? What are the other steps involved ? Surely there has to be more than just using floating point formats to render to a render target and then apply some bloom as a post process ? (considering the output will be 8bpp anyway) Basically, what are the steps for HDR ? How does it work ? I can't seem to find any good papers / articles that describe the process, other than this one, but it seems to skim over the basics a little, so it's confusing.

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• SSH Tunnel doesn't work in China

  - by Martin

  Last year I was working in China for a few months. I never bothered setting up a real VPN, but just created a SSH tunnel, and changed my browsers proxy settings to connect through it. Everything worked great (except flash of course) but that was fine. However, now I'm back in China but I'm having problems with this approach. I do the same thing as last time, and according to https://ipcheckit.com/ my IP address is indeed the IP of my (private) server in the US, and I'm logging in to my server using a fingerprint I created long before going to China so no MITM should be possible. Furthermore the certificate from ipcheckit.com is from GeoTrust - so everything should be OK However, I still can't access sites which are blocked in China. Any idea how this could be possible?

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• impossible to install Framework 3.5

  - by yae

  Hi few days ago I formatted one of my computers (XP Home SP2 with prior updates installed). Now I am trying to install NET Framework 3.5, but display this error: [03/21/10,17:19:36] Microsoft .NET Framework 2.0a: [2] Error: Installation failed for component Microsoft .NET Framework 2.0a. MSI returned error code 1603 [03/21/10,17:20:17] WapUI: [2] DepCheck indicates Microsoft .NET Framework 2.0a is not installed. Already i have tried this to try solve this issue, but the problem persists. 1.- unistall all frameworks and reinstall from scratch 2.- clean all temps file and reinstall from scratch 3.- unistall and clean all frameworks with dotnetfx cleanup tool and reinstall from scratch 4.- install .NET Framework 3.5 full package But all these possibles solutions have failed. Any idea to solve this? Thanks in advance

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• Vhost in Apache only working locally?

  - by Gasman

  Ok, I have added lines like: 127.0.0.1 somedomain.com Or some other domain that points to my routers IP, and is forwarded, but I get to the main site, but I want it to go to the subfolder I defined in my httpd-vhosts.conf: NameVirtualHost somedomain.com:80 <VirtualHost somedomain.com:80> DocumentRoot "D:/Apps/xampp/htdocs/somedomain" ServerName somedomain.com ServerAlias somedomain.com </VirtualHost> So, locally somedomain.com works, just remotely it goes to the root htdocs. So If I use a *:80 wildcard I works, but then everything points to the subfolder and all the other vhosts seem to get ignored. Any Idea why this is?

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• how to store and retrieve/generate UI?

  - by thindery

  I'm working on a site that will have hundreds, and eventually thousands, of paper products that users can customize online. Here is a very simple sample of what needs to be generated based on the product id: demo. This is a very simple version. I plan on replacing text fields with prettier elements(like the slider on tab 3). I imagine most of this can be achieved via jquery. So basically a product will have multiple pages(tabs), with multiple form elements on each page. I've never done a large scale project like this before and I am looking for ideas/suggestions for how I can store the info for each product that needs to be generated to create the UI. For each product, I need to store how many pages there are, what form fields are on each page, and the order of the fields on the page. As well as setting default text values and form options(font size, etc). Then with all this info stored somewhere, I can have the web app retrieve it and generate the UI with text fields, sliders, and other jquery-ish form enhancements, for that particular product. Can anyone toss out some suggestions, links, blogs, tutorials? I'm not really sure where to begin with this or what I need to start to investigate. I have experience with php, mysql, javascript, jquery, html, css, and that is really about it. I'm open to learning(and would enjoy exploring) new frameworks, programming, etc that will really get this web app working correctly, efficiently, and effectively. Maybe I should start looking into a mvc framework? like i said, i really have no idea what is the best approach. please let me know your suggestions!

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• How can I get my email to go to Gmail and my hosted server?

  - by Joseph

  I've switched my main domain to point the MX to Google Apps, and my actual domain's server with the lowest MX priority. My idea is to have my primary emails on Google Apps, where the secondary are via Cpanel. Is this even possible? Currently MX records read: 0 Google 4 Google 4 Google 9 Google 9 Google 10 My server I have [email protected] which is added in G. Apps, and [email protected] which is only added in cpanel. Is there anyway to get this to work?

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