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• Emails Generated From Our Linux Server are Blocked By Our Exchange Server (That Has Barracuda)

  - by Scott

  We have our company website hosted on a Linux machine. It is sending mail via postfix. The emails are working and being sent to all email clients like Gmail. However, we are not receiving the emails on our exchange server. When we look at the logs, we see that the connection is being refused, presumably by the exchange server. postfix/qmgr[11865]: DA6D42FF13: from=<[email protected]>, size=3166, nrcpt=1 (queue active) postfix/smtp[12474]: connect to mail.sanitizeddomain.com[XXX.XXX.XXX.XXX]:25: Connection refused postfix/smtp[12474]: DA6D42FF13: to=<[email protected]>, relay=none, delay=172915, delays=172914/0.03/0.07/0, dsn=4.4.1, status=deferred (connect to mail.sanitizeddomain.com[XXX.XXX.XXX.XXX]:25: Connection refused) We do run Barracuda. We cannot telnet from the linux machine to our mail server b/c we get the same message.

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• Can certain system-hungry modules be disabled in Ubuntu?

  - by Ole Thomsen Buus

  Hi, Let me add some context: I am currently using Ubuntu 9.10 64-bit (Desktop) on a relatively powerful stationary PC (Intel Core i7 920, 12GB ram). My purpose is highspeed imaging with a pointgrey Grashopper machine-vision camera (for research, PhD project). This camera is capable of 200 fps at full VGA (640x480) resolution. The camera is connected using Firewire (1394b) and the drivers and software from Pointgrey works great. I have developed a console C++ application that can grap a certain number of frames to preallocated memory and after this also save the grapped frames to harddrive. Currently it works fine but sometimes I am observing a few framedrops (1-3). When this happens I reset the experiment and repeat the recording and usually i am lucky the second time with no framedrops (the camera-driver has a internal framecounter that I am using). Question: I usually go to tty1 and use "sudo service gdm stop" to disable the graphical frontend. It seems to release some memory though that is not my main concern. My concern is CPU resources. Are there other system hungry modules that can be disabled temporarily such that the CPU gets less busy on Ubuntu 9.10? At some point in the future I will update to 10.10. Should I perhaps option for the server edition instead? Thanks.

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• To PHP or Not to PHP? [closed]

  - by Vad

  Should I learn PHP in depth for my smaller projects or not? My main knowledge is Java/JavaScript for the web. My old small projects were written in classic ASP. However, ASP had its days. Now I am looking into going deeper with another scripting language which I can use for small website projects. Though I know PHP on a basic level I never liked PHP. But I have to admit it is so widely used that I better start liking it. And all hosting services offer mostly PHP solutions. However, there is quite a number of issues with PHP when I google for it. Developers seem to not like it a lot. I wish I would use server-side JavaScript for all my needs, but hosting is an issue plus many small businesses already want to improve their existing PHP sites. And lastly, say I want to create a web app for distribution. PHP sounds like the best bet. Or am I wrong?

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• Get Func-y v2.0

  - by PhubarBaz

  In my last post I talked about using funcs in C# to do async calls in WinForms to free up the main thread for the UI. In that post I demonstrated calling a method and then waiting until the value came back. Today I want to talk about calling a method and then continuing on and handling the results of the async call in a callback.The difference is that in the previous example although the UI would not lock up the user couldn't really do anything while the other thread was working because it was waiting for it to finish. This time I want to allow the user to continue to do other stuff while waiting for the thread to finish.Like before I have a service call I want to make that takes a long time to finish defined in a method called MyServiceCall. We need to define a callback method takes an IAsyncResult parameter.public ServiceCallResult MyServiceCall(int param1)...public int MyCallbackMethod(IAsyncResult ar)...We start the same way by defining a delegate to the service call method using a Func. We need to pass an AsyncCallback object into the BeginInvoke method. This will tell it to call our callback method when MyServiceCall finishes. The second parameter to BeginInvoke is the Func delegate. This will give us access to it in our callback.Func<int, ServiceCallResult> f = MyServiceCall;AsyncCallback callback =   new AsyncCallback(MyCallbackMethod);IAsyncResult async = f.BeginInvoke(23, callback, f); Now let's expand the callback method. The IAsyncResult parameter contains the Func delegate in its AsyncState property. We call EndInvoke on that Func to get the return value.public int MyCallbackMethod(IAsyncResult ar){    Func<int, ServiceCallResult> delegate =        (Func<int, ServiceCallResult>)ar.AsyncState;    ServiceCallResult result = delegate.EndInvoke(ar);}There you have it. Now you don't have to make the user wait for something that isn't critical to the loading of the page.

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• Is sending data to a server via a script tag an outdated paradigm?

  - by KingOfHypocrites

  I inherited some old javascript code for a website tracker that submits data to the server using a script url: var src = "http://domain.zzz/log/method?value1=x&value2=x" var e = document.createElement('script'); e.src = src; I guess the idea was that cross domain requests didn't haven't to be enabled perhaps. Also it was written back in 2005. I'm not sure how well XmlHttpRequests were supported at the time. Anyone could stick this on their website and send data to our server for logging and it ideally would work in most any browser with javascript. The main limitation is all the server can do is send back javascript code and each request has to wait for a response from the server (in the form of a generic acknowledgement javascript method call) to know it was received, then it sends the next. I can't find anyone doing this online or any metrics as to whether this faster or more secure than XmlHttpRequests. I don't know if this is just an old way of doing things or it's still the best way to send data to the server when you are mostly trying to send data one way and you need the best performance possible. So in summary is sending data via a script tag an outdated paradigm? Should I abandon in favor of using XmlHttpRequsts?

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• GTK app: How do I create a working indicator with Qt/C++?

  - by hakermania

  I've tried in 2 forums, but I had no luck so far. So, I am using Qt IDE in order to build my application so as to participate to the Ubuntu Showdown contest. In my application, I've done the following: void show_app(MainWindow *data) { //this works fine: app_indicator_set_status(appindicator, APP_INDICATOR_STATUS_PASSIVE); //this crashes the application: data->show(); } void MainWindow::make_indicator() { if(appindicator){ //appindicator has already been created return; } appindicator = app_indicator_new("Format Junkie Indicator", "formatjunkie", APP_INDICATOR_CATEGORY_APPLICATION_STATUS); GtkWidget* showapp_option; GtkWidget* indicatormenu = gtk_menu_new(); GtkWidget* item = gtk_menu_item_new_with_label("Format Junkie main menu"); gtk_menu_item_set_submenu(GTK_MENU_ITEM(item), indicatormenu); showapp_option = gtk_menu_item_new_with_label("Show App!"); g_signal_connect(showapp_option, "activate", G_CALLBACK(show_app), this); gtk_menu_shell_append(GTK_MENU_SHELL(indicatormenu), showapp_option); gtk_widget_show_all(indicatormenu); app_indicator_set_status(appindicator, APP_INDICATOR_STATUS_ACTIVE); app_indicator_set_attention_icon(appindicator, "dialog-warning"); app_indicator_set_menu(appindicator, GTK_MENU (indicatormenu)); } So, basically I am trying to make a simple indicator entry, which, on click, it will hide the indicator and display the application. The indicator can be successfully hidden using the PASSIVE thingy over there, but, during the call data-show();, the application crashes. Any help on what I am doing wrong would be appreciated! Also, please help me to correct this problem I'm facing (alternatively, I will migrate to the old and good tray icon (it works fine in 12.04, anyway) which I can handle very easily and efficiently)

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• Install Linux with two hard drives

  - by rdecourt

  I've a machine with two hard drives. The first one has 80 GB and the second has 120 GB. I'm about to format this machine and install Linux, and I want to install all the main partitions (/, /boot, /usr/, etc.) on the first hard disk drive (sda) and mount the /home and /var partition on second disk (sdb). Is this possible, and do I have to do something after the instalation? Or is the second hard disk drive automatically mounted? How can I do it? I won't do it, but is there any problem to mount /boot on the second hard disk drive? I'm using Ubuntu 12.04.

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• Is there a way to make scp run faster on a Mac OS X?

  - by paul_sns

  I'm trying to a upload a Flex generated SWF file from my Macbook (running Snow Leopard) using the command scp main.swf server.com:/ I had setup key authentication to prevent typing the user/pass every time. This process normally takes up to two minutes using my connection at home (768kbps down/300+ kbps up). The interesting part is that when I use WinSCP in my Windows XP machine, the process only takes 30 seconds max. Both my MacBook and Windows XP machine use the same internet connection. The MacBook is connected to the router via cable (which should be faster right?) while the Windows XP connects through Wifi. Let me know if you need additional information in order to diagnose the problem. Thanks!

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• Is writing recursive functions hard for you?

  - by null

  I'm taking a computer science course now. I feel it is so hard compared to my polytechnic IT course. I can't understand recursive methods well. How do you manage to get your brain to understand it? When the recursive method returns back, my brain can not trace it nicely. Is there a better way to understand recursion? How do you start learning it? Is it normal that feel that it is very hard at then beginning? Look at the example, I'm very surprised how can I write this if it appears in exam. public class Permute { public static void main(String[] args) { new Permute().printPerms(3); } boolean[] used; int max; public void printPerms(int size) { used = new boolean[size]; max = size; for (int i = 0; i < size; i++) { used[i] = false; } perms(size, ""); } public void perms(int remaining, String res) { if (remaining == 0) { System.out.println(res); } else { for (int i = 0; i < max; i++) { if (!(used[i])) { used[i] = true; perms(remaining - 1, res + " " + i); used[i] = false; } } } } }

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• Conditional formatting & vlookup

  - by zorama

  Please help me with the formula: Main Sheet is Sheet2 B COLUMN I want to look up sheet1 A & B columns with Sheet2 A & B columns from 1 workbook that if sheet2 A are same/equal as Sheet1 A column, also if Sheet2 B column are same/equal as Sheet1 B column , how will I highlight the Sheet2 B column that if Sheet1 A & B + Sheet2 A & B are exactly equal . EXAMPLE: SHEET 1 SHEET 2 SHEET 2 Result A B A B A B CODE NO CODE NO CODE NO A 12 B 205 B 205 (highlight to red) B 105 B 20 B 20 (highlight to red) A 45 B 100 B 100 A 56 A 56 A 56 (highlight to red) A 78 B 25 B 25 A 100 A 12 A 12 (highlight to red) B 77 A 45 A 45 (highlight to red) B 108 A 20000 A 20000 B 20 B 205

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• Differences between FCKeditor and CKeditor?

  - by matt74tm

  Sorry, but I've not been able to locate anything (even on the official pages) informing me of the differences between the two versions. Even a query on their official forum has been unanswered for many months - http://cksource.com/forums/viewtopic.php?f=11&t=17986&start=0 The license page talks a bit about the "internal" differences http://ckeditor.com/license CKEditor Commercial License - CKSource Closed Distribution License - CDL ... This license offers a very flexible way to integrate CKEditor in your commercial application. These are the main advantages it offers over an Open Source license: * Modifications and enhancements doesn't need to be released under an Open Source license; * There is no need to distribute any Open Source license terms alongside with your product and no reference to it have to be done; * No references to CKEditor have to be done in any file distributed with your product; * The source code of CKEditor doesn’t have to be distributed alongside with your product; * You can remove any file from CKEditor when integrating it with your product.

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• clean reinstall of windows on dell xps 1530 using bundled software from dell?

  - by kacalapy

  i wanted to delete my laptop hard drive and reinstall the os that came on the media with the laptop originally. i booted from the windows disk and reinstalled windows but this did not delete my hard drive and even worse it made a windows.old folder with all my old junk on my c drive how do i get a clean/ deleted c drive with new install of my os? i have a small 120 Gig solid state hard drive with just one partition. i would like to create two partitions on the new install. my main issue is not being able to get a clean install such that the result is a pure windows laptop with no junk files that have accumulated over time. please advise.

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• Is there any way to prevent a Mac from creating dot underscore files?

  - by SoaperGEM

  At work we're letting one of our very tech savvy clients actually help out a little with a few development projects specific to him. However, he uses his own personal Macbook, and as he edits files on our (Windows) networks, his Macbook always creates a bunch of unnecessary meta files that we end up deleting later. For instance, it creates a file called .DS_Store in any directory he opens, as well as "dot underscore" files for each file he edits. So for instance, if he's editing a file called "Main.php", his Macbook will create another file called "._Main.php". I know there are ways to prevent creation of .DS_Store files, but none about how to prevent creation of these hidden files prefixed with dot underscore. Is there any way to turn that off on Macs? Any way to prevent it from creating those files in the first place?

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• PDF form created in Libre Office - trouble with form fields and font sizing

  - by soawesomejohn

  I am trying to create a PDF Form using LibreOffice. I can create the form elements and export as PDF. However, the form fields are giving me problems. The text in these fields always centers on the bottom, and often the text you input is cut off at the bottom. I found that if I make the fields larger, the text no longer cuts off, but the field is exceptionally large with lots of space above the text. I have made an odt (source) and a pdf (export) file to show what I'm running into. I tried a number of different fonts and sizes, but to make things easier, I made the field names all "field1" so that once you fill out one entry, all fields show as filled in. http://ytnoc.net/files/sampleapp.odt http://ytnoc.net/files/sampleapp.pdf My main question is how do I make form fields that don't cut off the text without having to make the fields way oversized? Made with LibreOffice 3.3.0

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• clean reinstall of windows on dell xps 1530 using bundled software from dell?

  - by kacalapy

  i wanted to delete my laptop hard drive and reinstall the os that came on the media with the laptop originally. i booted from the windows disk and reinstalled windows but this did not delete my hard drive and even worse it made a windows.old folder with all my old junk on my c drive how do i get a clean/ deleted c drive with new install of my os? i have a small 120 Gig solid state hard drive with just one partition. i would like to create two partitions on the new install. my main issue is not being able to get a clean install such that the result is a pure windows laptop with no junk files that have accumulated over time. please advise.

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• Minimum Requirements for (open) Solaris?

  - by Electrons_Ahoy

  I'm thinking about knocking together a Solaris box at home to act as a combination server and learning exercise. What are the minimum hardware specs I can throw at it such that it'll be actually usable? I'd be cobbling the machine together from a stack of various x86 PC spares/leftovers. Does anyone have experience with Solaris at the lower end of the spectrum? The Sun site, for example, claims it'll run with as little as 255 megs of ram, but is it worth the exercise with less than a gig? Will my old Pentium II 450 cut the mustard? (I'm willing to throw a couple of bucks at pricewatch/mwave/newegg on this, but if I need to build a better rig than my main PC, I may not bother.)

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• How can one-handed work in Ubuntu be eased?

  - by N.N.

  My right hand is temporarily immobilized and I would like to do some minor general work on my computer. Mostly web browsing, mailing and file and directory browsing and editing. For this I currently use Firefox, Thunderbird, Nautilus and the GNOME terminal (I have already asked a specific question about Emacs). Are there ways to ease such, or any other general, one-handed work in Ubuntu? I have found http://stackoverflow.com/questions/2391805/how-can-i-remain-productive-with-one-hand-completely-immobilized but that is not exactly what I am asking for. I want to ease whatever little time spent one-handed in Ubuntu and this is also interesting for situations where there is no injury involved, such as when one hand is occupied. I do realize I should avoid unnecessary strain. The main thing that is much slower one-handed is writing. Since I am only temporarily immobilized it seems to make no sense learn a new keyboard layout. I would be surprised if I managed to learn and become more effective with a new keyboard layout (than one-handed QWERTY) before I can use my other hand again. What I have already found: Sticky keys for making it easier to enter keyboard commands. When writing one-handed there are more cases of where it is useful to paste in phrases rather than to reenter them. It is easier to use Super+S rather than CtrlAlt+arrow keys to switch work space.

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• Port forwarding on D-Link DIR-615 super-slow, useless

  - by Jaroslav Záruba

  Hello I have replaced my old router with DIR-615 from D-Link, and now the port forwarding is so slow it makes the router practically useless. Accessing the router itself (admin UI) is without issues, no delay whatsoever. But when I try to access a service on another computer in the network the requests take minutes and minutes. (E.g. I can see source of my GWT-app main page, but loading additional CSS and JS files takes years.) If anyone could recommend any further diagnostics I should do to figure out what is happening it would be great. Few notes: happens with more services (web-app on Tomcat, viewing directory index via Apache) it does not make a difference whether the service is hosted on wired or wireless PC accessing the service on a localhost works fine turning off firewall on the target PC does not make difference either (makes sense) when I replace this router with the old one (both 192.168.1.1) everything works fine I see nothing suspicious in the router's log I believe I have the latest firmware (4.11) DIR-615 sucks, it already died once completely Regards Jarda Z.

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• How do I interpolate air drag with a variable time step?

  - by Valentin Krummenacher

  So I have a little game which works with small steps, however those steps vary in time, so for example I sometimes have 10 Steps/second and then I have 20 Steps/second. This changes automatically depending on how many steps the user's computer can take. To avoid inaccurate positioning of the game's player object I use y=v0*dt+g*dt^2/2 to determine my objects y-position, where dt is the time since the last step, v0 is the velocity of my object in the beginning of my step and g is the gravity. To calculate the velocity in the end of a step I use v=v0+g*dt what also gives me correct results, independent of whether I use 2 steps with a dt of for example 20ms or one step with a dt of 40ms. Now I would like to introduce air drag. For simplicity's sake I use a=k*v^2 where a is the air drag's acceleration (I am aware that it would usually result in a force, but since I assume 1kg for my object's mass the force is the same as the resulting acceleration), k is a constant (in this case I'm using 0.001) and v is the speed. Now in an infinitely small time interval a is k multiplied by the velocity in this small time interval powered by 2. The problem is that v in the next time interval would depend on the drag of the last which again depends on the v of the last interval and so on... In other words: If I use a=k*v^2 I get different results for my position/velocity when I use 2 steps of 20ms than when I use one step of 40ms. I used to have this problem for my position too, but adding +g*dt^2/2 to the formula for my position fixed the problem since it takes into account that the position depends on the velocity which changes slightly in every infinitely small time interval. Does something like that exist for air drag too? And no, I dont mean anything like Adding air drag to a golf ball trajectory equation or similar, for that kind of method only gives correct results when all my steps are the same. (I hope you can understand my intermediate english, it's not my main language so I would like to say sorry for all the silly mistakes I might have made in my question)

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• Failure Driven Development

  - by DevSolo

  At our shop, we strive to be agile. And I'd say we are making great strides. That said, a few of us have spotted a pattern we have started calling "Failure Driven Development". Failure Driven Development can basically be desribed as an agile release/iteration cycle where the bugs/features are guided not by tasks and stories with acceptance criteria, but with defects entered in the defect tracking software. Our team has a great Project Manager who strives to get the acceptance criteria from the customer(s), but it's not always possible. From my development chair, this is due to the customer either not knowing exactly what they want or (and this is the kicker) two different "camps" at the customer's main office conflict with how a story should be implemented. Camp A will losely dictate that Feature X works like this, then Camp B will fail it due not functioning like that. Hence, the term "FDD". The process is driven by "failures". This leads to my question: Has anyone else encountered this and if so, any tips/suggestions for dealing with it? We have, of course, tried to get Camp A and B to agree prior, but everyone knows this isn't always the case. Thanks

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• Advice on designing web application with a 40+ year lifetime

  - by user2708395

  Scenario Currently, I am apart of a health care project whose main requirement is to capture data with unknown attributes using user generated forms by health care providers. The second requirement is that data integrity is key and that the application will be used for 40+ years. We are currently migrating the client's data from the past 40 years from various sources (Paper, Excel, Access, etc...) to the database. Future requirements are: Workflow management of forms Schedule management of forms Security/Role based management Reporting engine Mobile/Tablet support Situation Only 6 months in, the current (contracted) architect/senior programmer has taken the "fast" approach and has designed a poor system. The database is not normalized, the code is coupled, the tiers have no dedicated purpose and data is starting to go missing since he has designed some beans to perform "deletes" on the database. The code base is extremely bloated and there are jobs just to synchronize data since the database is not normalized. His approach has been to rely on backup jobs to restore missing data and doesn't seem to believe in re-factoring. Having presented my findings to the PM, the architect will be removed when his contract ends. I have been given the task to re-architect this application. My team consists of me and one junior programmer. We have no other resources. We have been granted a 6-month requirement freeze in which we can focus on re-building this system. I suggested using a CMS system like Drupal, but for policy reasons at the client's organization, the system must be built from scratch. This is the first time that I will be designing a system with a 40+ lifespan. I have only worked on projects with 3-5 year lifespans, so this situation is very new, yet exciting. Questions What design considerations will make the system more "future proof"? What experiences have you had in designing such systems - both failures and successes? What questions should be asked to the client/PM to make the system more "future proof"?

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• Accessing server by dedicated IP address

  - by Sherwin Flight

  I'm having an issue with my hosting provider after migrating to a new account. It's taking some time to get the problem sorted out, so I am hoping someone here can shed some light on the situation. The server is running WHM/cPanel, and the site I am trying to access has a dedicated IP address. When I connect to the server like this http://IP.HERE instead of showing my the website the way I would expect, it is showing the contents of a subfolder. So, while I would expect it to load public_html/ it is loading public_html/somefolder/ instead. Any idea why this is happening instead of showing the sites homepage the way I would expect? EDIT It is not redirecting, so the url is just http://IP.ADDRESS/, but the files listed are from a subfolder. So, it LOOKS at though I went to http://IP.ADDRESS/subfolder, when the URL says it should be showing the main folder contents. When I access the site using the domain name, it works properly, so I assume the document root is set correctly.

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• OS X server 10.6 - how to restore default groups?

  - by Zoran Simic

  I've set up my OS X server as an open directory master first, then (experimenting), I've changed it to standalone server, then set it back as an open directory master again. Now, all the default groups I saw before are gone (Domain Administrators, Domain users etc). Do you know how to restore these groups? Note that the groups are gone only from the Workgroup Manager UI. They do seem to be still there otherwise. id -G gives the usual list of groups. If I create an account and makes its primary group 'staff', Workgroup Manager shows all the inherited groups properly (but not on the main list). If I create an account and associate it to a new group I just created, then the account has no inherited groups...

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• "TDD is about design, not verification"; concretely, what does that mean?

  - by sigo

  I've been wondering about this. What do we exactly mean by design and verification. Should I just apply TDD to make sure my code is SOLID and not check if it's external behaviour is correct? Should I use BDD for verifying the behaviour is correct? Where I get confused also is regarding TDD code Katas, to me they looked like more about verification than design; shouldn't they be called BDD Katas instead of TDD Katas? I reckon that for example the Uncle Bob bowling Kata leads in the end to a simple and nice internal design but I felt that most of the process was centred more around verification than design. Design seemed to be a side effect of testing the external behaviour incrementally. I didn't feel so much that we were focusing most of our efforts on design but more on verification. While normally we are told the contrary, that in TDD, verification is a side effect, design is the main purpose. So my question is what should I focus on exactly, when I do TDD: SOLID, external API usability, or something else? And how can I do that without being focused on verification? What do you guys focus your energy on when you are practising TDD?

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• Debian, CentOS, Slackware, FreeBSD, OpenSolaris and Ubuntu Server Edition: Which one to use for an http web server?

  - by Ako

  I am going to install and administrate a virtual server for a small university. The server should run inside a virtual machine (VirtualBox OSE). It is only used in the university network and is invisible to the outside world. It should run Apache web server for PHP, MySQL and probably a mail server. I don't know which OS to use. Main criteria for choosing include ease of administration and updating, package management and performance. I wonder if anyone has any suggestions? And candidate OSs are: Debian, Ubuntu, CentOS, Slackware, FreeBSD, OpenSolaris. Add any other OS if you know any better alternatives.

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